Had my C4 for 15 years. Cost wise they are the lowest valued, but that just means you can get a corvette grin for less.
They are not perfect, but you won't find many flaws unless you want to push it to ten tenths. As with most vettes the later years are usually the better ones, for example the "Christmas tree" dash was gone as of 1990. You can still do a lot of work on them yourself
and parts are easy to find. There is a ton for info on line and you can easily review recommendations/problems etc etc. This forum is also an excellent source of info . Good Luck.