I've got a T-Kingdom m1700, which is pretty comfortable but gives me the uniboob of doom, because otherwise I'll spill out the armpit holes, the binding area's not big enough. Obviously have to wear pretty loose clothes over it because of the velcro and the uniboob. Despite that, it's still a rather good squisher, and pretty comfy. I tried the m980 and it was nowhere near strong enough because the binding area was only at the front, the back stretched and it didn't bind at all, so I returned it and paid the extra to exchange it for the 1700. I've also got a m801, the short one with the zipper, which is ridiculously easy to get into, no velcro to snag on the soft part of the binder like the 1700, but the material doesn't seem as heavy duty as the elastic on the 1700, so I think it'll probably have a shorter lifespan. I've got more room to move things around in it because of the way it's made, so things get squished to the middle of my chest a bit less. The zipper and how I don't think it'll last as long are why I don't wear it as much as the 1700. (they're both medium)
I had a horrible time getting into, and out of, the Underworks double-front I have - it's a small. My hips are too big for me to step into it, my shoulders big enough that getting it on over my head is a major ordeal - I tried it on once to see if it was even possible to get into it or if I needed to send it back and I haven't been in it since. It didn't seem *that* much better than the m801, not for the effort it took to get into it, but it was a lot cheaper.
Still, binders by their very design have the edge in comfort over bras, at least if they're not too tight - they don't have a strap or an underwire to dig in at one specific place on your ribcage, and because they squash in and not down, they're not pulling down so much on your shoulders and making those straps dig in. I wore a new sports bra the other day (was trying to find a good squisher-bra locally, for when I wanted a little less uniboob and to imply to my mother that everything I have that smashes them down is indeed a sports bra - *thought* I found a good one...) and it was killing me after about an hour or two with the shoulder straps digging in, but I couldn't go home and change until the end of the day. I'm 32C-D to 34B-C-D, depending on brand and style, it's an utter beast to fit in anything other than overly saggy underwires, and my favorite brand only goes as small as a 34, which stretches out real fast. Small wonder I want to smack those bad boys down instead - I have utterly had it with this bra BS. I just wish T-Kingdom were cheaper - I think I'm going to check out the Juya or Esha ones.
