What's stupid is that five-seven is a lot better than the CZ, a lot more ammo, more armor penetration, more overall damage and also has a great fire rate, but no auto.
On the other hand, for T side it replaces the tec-9 which is less used, but then again, in T side it's better to use a gun with more ammo like the p250, which is cheaper and has lots of ammo.
On CT side it will be stupid to use the CZ over the 5-7, the auto fire doesn't worth the advantages the 5-7 has.
On T side it's not worth it, you could buy a p250 and a flashbang instead which can do a lot more, in eco round you don't expect to win, and if you lose, you lose more money.
Pre-firing with the CZ is much harder because it consumes ammo really fast.
Even dualis are worth buying instead.