The CZ's I have used all ran out of the box. There are no more issues with reliability with the CZ over the Glock. They are so different as to be similar only in caliber, though, so comparison can only be in the extreme. The CZ points better and is more comfortable to shoot but the Glock is lighter and arguably more comfortable to carry. Pick what you will, but there is no difference in reliability or performance between the two. Anybody who says there is is speaking only anecdotally.
Bear in mind, though, that the only folks in the world who copy Glock are the Croatians. The Swiss, Chinese, Italians, Czechs, Israelis, and Turks all have copies of the CZ (given, of course, that Tanfoglio makes parts for the Israelis and Turks) in production. The Glock is popular here, but in the world, it plays second fiddle to CZ. Now, that isn't necessarily a good reason to get CZ over Glock, but if Glock seems so popular inthe US, it doesn't reign king everywere.
Ash