TBH I kinda love this thing.
This is the best binder I've had, and I've had quite a few binders. It's the most breathable of anything I've ever owned; I barely sweat in it at all and can almost forget that I'm wearing it through the duration of the day. It gives the appearance of smaller pectoral muscles (with a B/C cup starting) and has decent tummy flattening capabilities (but don't expect a miracle). Keeps everything in place well.
For the money you'll spend for this, there is no reason to hesitate. This is the **perfect** item for first-time buyers or anyone who just wants to try it out. I seriously cannot stress the comfort of this thing. You will have to wear it under something, as it's sheer, but I have no problem concealing it under a shirt.
The one thing I will mention is that it does tend to be slightly irritating in the underarm area and a bit around the neck because of the nylon material, but it's nothing slight adjustments won't fix, and it's worlds better than anything else I've ever tried.
One final bonus: it doesn't pinch around the ribs, so you'll be able to take full, deep breaths instead of panting all day and getting headaches because of air loss.
Seriously, buy this, guys.