I had an '83 zxt since it was new until it had about 100K+ miles or so. Problems started coming up after a few years that seemed premature. Here is what I remember about it for what it's worth:
Ignition - bad transitor on coil.
Turbo - bad bearings (I was running a dino oil in it. After first turbo replacement, switched to Mobil 1.
5 speed - premature wear on input shaft and input bearing. suspect this was due to excessive heat put out by the turbo. Revisited this issue several times. Finally machined tranny housing and put in much larger/better input shaft bearing.
headlight switch - burnt contacts
Radio/Cassette player - electronics problems
Idle air valves - worn air valves causing vacuum leaks, poor idle, etc
climate control - poor temperature regulation. A/C not really up to the job in South/Central Texas.
Power steering rack oil leaks
Mushy stock suspension. Rear trailing arm setup results in lots of squat.
Leather/suede seats that were mostly plastic and tore up rather easily (got a ~$300 credit from Nissan on that as a deceptive advertising lawsuit settlement. Used the credit to buy new rear brake calipers to replace the original ones).
Leaking T-Tops
Bad power antenna
Fuel injector problems and connector corrosion.
Under hood plastic electrical connectors disintegrated - more problems that were probably related to high under hood temps from the turbo.
Never had problems with digital dash though.
The car wasn't all that bad really. It was fun to drive and made several road trips to the North East from Texas without problems and was my primary transportation for may years. The car was eventually wrecked (totalled) and the still strong engine and tranny were donated to an early 240Z conversion project. After that, I replaced the 280zxt with other cars that I still have (C4 Corvette, a pickup truck, an SUV) but my weekend "fun" car is now a '73 240z.
--john