Check out the "CZForum.com - Clone Club" website:
http://pub105.ezboard.com/fczechpistols82792frm35
Everything you'd want to know about CZ's and their various clones (Tanfogilio/Witness) can be found there. The pistols are all based on the Chech CZ-75 design. This is basically a Browning operating system design (i.e. Browning Hi-Power Hi-cap 9MM) - with the major diffenance being the slide rails are internal (like the SIG 210) - rather than external (like S&W, Ruger, Glock - and Browning HP).
I've got an older Tanfoglio (the actual Itallian manufacturing company) model. The pistol is very accurate, easily handled, reliable (with proper maintenance & ammo) and is of superior ergonomic design to many popular auto loaders. Tanfoglio supplies finished pistols or major components to many manufacturers & importers who have produced such pistols as the EAA Witness, Bren 10, TZ-75, TA-90, Sphinks, IMI Baby Desert Eagle and Springfield P-9.
These are very popular pistols in Europe and Asia, and have a considerable following in the USA in competition shooting. Worldwide, they are probably second only to the Colt 1911 design in terms of popularity and custom accessories available to build whatever type of auto pistol you may desire. The EAA Witness "brand" pistols are most comonly found in the U.S., though variations have been imported under the names of F.I.E and Excam in previous years. They are available in a number of different calibers & configurations. Base prices tend to be very reasonable (under $400).
In my personal opinion, these are very good "race gun" platforms - and good for those who desire a comfortable and accurate out of the box plinking pistol. As a personal defence weapon though - they are very tight (which helps with accuracy) - but are less tollerant of poor maintenance, lubrication and inconsistantly loaded (cheap - bulk - reloaded) ammo than the more "service" oriented Ruger, S&W and Glock semi-autos.
In summary, if you are going to bet your life on a fairly low maintenance, knock around service auto pistol - get a S&W, Ruger or Glock. If you are looking for a casual plinker - are willing to keep up with ongoing cleaning & lubrication for CCW - or looking for a base platform gun for competion shooting - they are hard to beat.