I have a t-kingdom 801, which is the sports-bra-ish one with a zipper down the front.
for reference, I'm 5'6", 145lbs, 30/32B cup.
It doesn't bite at all around the arms, and the shoulders are comfy. On me, it comes down almost exactly to the bottom of my sternum, so the pressure of the bottom seam on my ribs really gets to me after 5 or 6 hours, and I feel the need to try and tug it down; it always ends up right back in the same place. I think it's worse than it would be for other people, because it makes my stomach poof out underneath it, and I'm exceptionally self-conscious about being 'fat'.
The binding quality is nice. When you first put it on, you can either push your lumps up and out to the sides, or down and out to the sides.
Up and out can leave them sort of protruding from the arm-holes, which is fine in loose clothing, but might be awkward in tight clothing. I also needed to stop and 'adjust' myself halfway through a 9 hour workday when I did this, because they slowly migrated inward. The shape looks the best this way, for a manly profile, I can usually totally eliminate that underbust shadow. It does end up looking like I have a set of pecs, which is awkward with noodly arms, so I either wear a slightly loose shirt, a black shirt, a button down shirt, or a 2/3 or 3/4 sleeve long shirt under my overshirt it to cover my arms.
Because I work in a greenhouse and am rather active (walking, running, moving and lifting heavy objects, getting wet, etc), I usually adjust down and out; not quite as awesome of a manly chest, but flat, and more comfortable for me. They don't migrate at all, and I still usually don't have any underbust shadowing to make it look strange. I do tend to sweat in the chest-area more like this though, so that's something to consider.
As for the company, I ordered mine on a thursday, and it was at the post office (USA-east coast) by the following tuesday; with the extra 10USD or whatever for quick shipping. They make much smaller sizes; I have a size L with them, compared to the XS I ordered from underworks on their 997--Double Panel Compression Shirt Binder. I may have been able to fit an M, but I don't know that I could have gotten it zipped up at all. They definitely break in after the first 2 or 3 wears.