Like any car, if it's been looked after then reliability isn't such an issue.
They are the age now where most "flaws" have been worked around with aftermarket parts/improvements and lead to a much more reliable package.
I've never driven a Tuscan, but I have had a blatt in a T350 and it was equal parts exciting/terrifying.
Plenty of TVR experts, and there is a very good buying guide for the Tuscan on PH.
Just be sure to research the expert you plan to use as some have better reps than others.