I'll add my $0.02 here, since I just bought this without much information prior.
This is a nice product, first of all. It does exactly as it describes, and probably a bit easier than some other products. I went with this one specifically because I have a job working out in the wilderness all day with just guys and no restroom. My options are limited to trees or the nearest boulder. Medicine spoon models have always been iffy for me, and the amount of adjusting they take would have honestly just looked weird within eyeshot of 9 other guys, even from behind. Some of the other funnel types were either very expensive, or also looked like they needed a bit of adjusting before doing your business, and the reservoir openings on some of them looked a little sketchy...not as much of an exact science, if that makes any sense.
I'm going to do my best to describe this, as the photos of the product didn't make a whole lot of sense to me initially, and I imagine I'm not the only one:
This is made of semi-firm silicone. It's not squishy like in a cyber-skin packer, and could not pass a "grope test." The balls and shaft point almost straight down from your body, at just a bit of an angle. It's not super-rigid, but I could probably best compare it to the firmness of a rubber spatula. The inside of the shaft is pretty hollow, and it can easily bend, however, the biggest problem I've run into is that it does not bend easily enough for underwear to keep it from protruding. As it points at a downward angle, standing up, it almost isn't visible at all, however, I have to be careful how I sit down. Between the material making the shaft solid enough, and and the fact that the balls are pretty solid and protruding themselves, if I wear anything other than baggy jeans and just sit down casually with knees apart, I instantly look very excited, and at a kind of unnatural angle. To remedy this, I wear baggier pants with a crotch that sits lower than I usually would, and tend to pull the legs of my pants down just a bit as I'm sitting to prevent any bunching in the crotch/hips, which would make it more obvious. It also presents a problem with crouching and bending at awkward angles, which I have to do at work a lot.
The other thing that has taken some getting used to is that the reservoir is made to sit "in place" pretty much all the time. This is a bit awkward, especially since at work I do a lot of bending/lifting/digging/swinging a pick axe, etc, and it can end up at some really uncomfortable angles from time to time, though usually it only takes a quick, inconspicuous grab to "reset" it.
Given that I don't have close to $200 to spend on one of these, I'm left with very few choices, and I drink a lot of water at work, and consequently have to pee sometimes.
The awesome things about this product:
It does sit "in place" pretty much all the time. That's why I bought it. I can walk over to the nearest tree, whip it out, and just go, with little to no adjusting, looking totally natural to anyone who might glimpse my way (in my line of work I don't really have to worry about guys peeking or seeing it from anything other than a good distance). It's ready to go at a moment's notice. The fact that it's fairly solid prevents it from folding, collapsing, or going anywhere that would require adjusting when I just don't have the time or place to do so most of the day. I'll gladly take being a little uncomfortable over being seen awkwardly sticking both hands in my pants to mess with something every time I have to pee.
I did skip the packing strap as it's made out of vinyl and I'm hot and sweaty enough all day as it is. I modified a jock strap to hold it (which is very comfortable - I can provide instructions if you'd like), and bought a few pairs of athletic-fit boxer briefs. These help to hold it in place as much as possible, and also to kind of cup it so that it feels like it chaffs a little less (silicone coming out of your crotch does tend to wear on your thighs after a day of hiking). I use a tank top undershirt, as they're pretty long, just in case the harness starts to hike up in the back so it will stay invisible, though I haven't had this problem so far.
I've found that the trick to actually using it is 2-fold:
1. You do place it around the outer area of your genitals. While you don't need to line the shaft right up with your urethra (which would be very awkward), it does help to act more like your trying to pee straight into the shaft...as in, don't just try to pee into the reservoir and hope it catches all of it. The shaft should not be out over your pubic bone, but rather under it, just a little. It needs to be placed low enough to feel like you are peeing through the shaft. This is why it does not have any extra material above the shaft. I hope that makes sense.
2. Since you're not actually lining the shaft up with your urethra and the reservoir is there for a reason, arch your back and try to make sure the reservoir is flowing downwards. After experimenting with the faucet (and since the whole shaft is hollow ending in a slit - it's not just a small tube) it's pretty obvious that it should actually catch whatever you can dish out unless the reservoir starts to tip back at a level or backward angle. That's when it starts leaking out the back. Aim your pelvis down, pee low, don't try to arc your stream too much...no need to be showy. A lot of guys straddle the urinal/toilet a little anyway. Just hold it where it hangs naturally and go like you were peeing on the floor a foot or less in front of you - you'll be more successful and look more casual.
I can answer questions If I'm not making sense. Good luck!