I work on them, drive them...etc.  I
don't like them.  Unless they have changed
the controls inside this year, (haven't been in
a 2007 yet), I find the CTS to be least
intuitive vehicle GM has when it comes to
figuring out how to do anything when it
comes to your radio controls, menu items..
etc.

The engine is a good engine mechanically,
the rear axle always springs a leak at the
pinion seal, there have been vibration issues
with the driveshaft.  Front brakes can wear
out fairly early, and they always take out the
front rotors (ie: you won't be just machining
the rotors, you will replace them, as the brake
pads wear the rotors down enough to take
them below min spec).

Now the CTS-V version is a pretty cool
vehicle....but it has it's own set of problems.
Like uncontrollable wheel hop.

Ian