To answer your questions, CZ's customer service has a bit of an unfriendly reputation. But luckily their pistols rarely, if ever, need any customer service. The quality of gun is very good. They are normally very, very reliable.
I have owned 2 Glocks, a Springfield XD-9, a CZ-75 (pre-B) and I currently own a SIG 229 in 40S&W and a CZ-97B. I may be fortunate because I have never experienced a failure in any of these pistols whatsoever in the few thousand rounds I've put thru all of them. All seem very well-made to me. Of them, the SIG is an engineering marvel. The SIG is very well machined, amazing trigger pull and the slide is smooth as glass. I love my CZ though. SIGs and CZs are my favorite pistols, for different reasons. The CZ isn't machined as well on the inside (shows circular tool marks inside the slide), but this won't affect function at all. CZ triggers aren't the best, but they aren't the worst either and are very usable. The factory mags for the 97B (Mec-Gars) don't drop free either like SIG mags with the spring loaded mag release catch. The CZ has a reputation of being a very reliable, affordable, well-made pistol that you can bet your life on. Their affordability and their reliability make them a wonderful choice. The SIG may be better machined (although not necessarily more reliable), but you will possibly pay twice as much for a SIG.
I would recommend you look at the CZ P-01. CZ-75's are great pistols but the design is a little outdated for modern use. The P-01 is easier to conceal, has undergone more rigorous, legendary testing (although this doesn't mean it is significantly more reliable than a CZ-75B), and makes a better fit in the hand for most people. It seems to be a very outstanding pistol that should rival SIGs and Glocks for overall quality and durability. I will be getting one within the year, along with a SIG 239 in 9mm.
One thing to watch out for on CZ's is their firing pin roll pin. If you dry fire the pistol a lot, the pin that blocks the firing pin can break after a few hundred dry fires. The pin isn't really a pin, it's a rolled piece of sheet metal and therefore weaker than a solid pin. But if it breaks, it isn't hard to replace. Just get the right size diameter dowell pin from the hardware store, cut it to length and insert it. SIGs have solid steel pins in comparison. Also, CZ springs can be weak, especially in the mags, so they may need replacement with Wolff springs as others have mentioned. CZ also supplied my 97B with a half-length, plastic guide rod which I wasn't happy about. It doesn't seem to affect function at all, but these little shortcuts are probably what makes it affordable compared to the more expensive SIGs and Glocks.