Supra and reliability is not a word some peeps will use in the same sentence, unless the NOT is also in there somewhere.
Myself, I find the supras very reliable. I believe it all to be a question of maintenance, and your driving skills. I have had many cars that peeps didn't want, but I manage to drive them very long without problems. Do i drive like gramma going to church on sundays, no. Do i drive like a wreckless maniac cutting peeps off and basically making myself public enemy number 1, well, no again.
i bought a 91 mk3 supra 2 years ago. it had 90kilos on it, i paid 12,000, and it e-tested and cert'd fine witout any work needed. I even e-tested again this year with another pass. All i have done in that 2 years is check the brake pads for wear, and make sure the sliders were sliding, replace 2 worn tires out front, and add an exhaust. nothing has broken unexpectadly. the supra now has 144,000kilos, so i do drive it a fair bit.
93-up supras are known for some common problems, like 2nd turbo whinig and dieing, noisy gear box and noisy rear end. You will find much more info on the forum wwwi-supra.com, which is mostly a 4th gen supra board. Also look at places like www.suprastore.com and www.mkiv.com.
You won't find many 4th gen supra owners in here, as this is a new board, only over a year old, and populated with mostly camry and corollas.(no offense guys)
if you wanna see a 4th gen supra, come by kelseys at hurontario and steeles tonight. there will be a red 94 for sale, along with possibly a couple of others, baring any snow or rain, ofcourse.