CZ Pistols are awesome. I have 7 different varriants of the 75b. The 550 American is a great rifle. I have one in 6.5X55. My only problem with it is the stock is too pretty to hunt with.
Put it this way: It says a lot about CZ's reputation and the reputation of the 550 that I am even considering taking another bite of the CZ apple.
I wasn't trying to knock them, and I know most people love CZ. I'm just can't discount the previous experience with the 75B.
Does your 550 have machine marks or other blemishes from the factory?