I have owned four Corvettes prior to my 1999 ('60, '63' '77, '89). The 1999 Corvette is by far the best model of them all. Reliability and performance are outstanding; it is comfortable and fun to drive; the fit and finish (both exterior and interior) are laudiable; the cost to own is reasonable; and the resale value is great. Overall it is just an outstanding vehicle!
LS1 engine, bose audio system, automatic trnsmission, accurate DIC, 12 CD factory changer, overall design, exterior and interior fit and finish.
I really can't suggest improvements. The 1999 Corvette is fine as built by Chevrolet and one of the best Corvette model years since 1953.