Another yes from me, I've had two TT's and both of them have been brilliant.
A lot will depend on whether you're averse to spending money on cars. I don't mind servicing my cars every 3 months and lavishing them with TLC. I imagine like a few other members on here, I'm a bit of a perfectionist and like my cars to be immaculate in every sense. With this approach and attitude towards the supra, I've found it does nothing but reward you with hours of driving fun and pleasure.
Neglect them however, and I'd imagine like any mechanical object, they'll go wrong and bite you hard in the process.
Make sure that the slate you start with, be it a blank one, or a lightly modded car. make sure it's a good one. Reciepts, history, and the current owners enthusiasm for the car will show whether it's a good one. Due to these cars being relatively cheap now, some have had the misfortune of falling into the wrong hands, and have been abused. As a result will be nothing but greif.
To summarise then, if you're willing to put the effort in for the general upkeep and don't skimp on looking after it, the car will be a joy to own. Make sure the car you buy is a nice example to start with.