No doubt they fixed some of the '05 issues, yeah, right. The only
disadvantage to the '05 is the sloppy shift gate that has to be
negotiated to "ALWAYS" put it in reverse to shut down. If not done
correctly it is not turned off completely and will drain your battery.
I hear the "feature" was eliminated on the '06, I wonder why? They
liked the shifter rattle in the C5 so well they kept it for the new
C6. My preference would be the 6 speed paddle shift automatic of the
'06, better gear ratios and a number of problems have been with the 6
speed manual. The '05 has the tried and true 4 speed automatic with
overdrive, nearly bullet proof.
If you are going with the automatic it's up for grabs which you chose,
if it's a standard shift get the '06. YMMV