Just shooting the CZ's won't cure all the trigger roughness issues. However, the CZ's aren't bad to work on or have work done on and they can produce some of the best triggers around if done right. My friend is a huge Sig fan but I think he changed his mind a bit after I let him shoot my Shadow. Points intuitively, very steady recoil (versus his new P229 where the muzzle likes to flip up a bit) and a crisp 2.5lb SA trigger pull. When he was able to shoot a better group with my gun the first time out than the Sig he's put several thousand rounds through, well, I think he may have changed his mind a little.
All that said, CZ's will take a bit of work to get them to really shine. If you buy a factory version NIB and don't ever do anything to it, the trigger will smooth out a fair bit (assuming you shoot it enough) but it won't be perfect. On the other hand, if you do an action job, install a cajun gun works or czcustom hammer, and tweak the springs, it will feel like a completely different gun.