The button feedback is quite good; you can feel the click on each press, unlike on some other cases though the volume buttons feels better than the slightly tighter power button. The cut-out on the bottom has ample space for opening the port cover, as you can see on the picture with the charging cable attached. On the 4th picture, you'll see there is a pronounced lip on this case, for that lay-on-table buffer for your screen. As for the fit, the tight bumper edges makes it a very snug fit via a quick snap on. Taking it off, on the other hand, can be more of a pry, requiring you to pry off the case with care.
I can't say too much about the actual drop protection because I haven't dropped my phone yet, but the tight fit should ensure that the case won't be coming off the phone in case of impact. The polycarbonate on the case feels adequately solid, not brittle. It is a slim case after all, so it's more geared towards preventing scratches than buffering against drops per se.
But the most important part of this case is its looks. There is a opaqueness to the clear back, a frostedness that goes quite well with the white back shell on the S5, resulting in a milky look. The thin gray rubber lines on the back provides good contrast. The Poetic branding on the back is a bit too big, but I like the nice drop shadow effect it makes. I'm overall very happy with the way this case looks with the white Galaxy S5.