Of course I'm a bit biased but I like the J30. Power-wise, it's not a Q45 but it does fine. The engine is basically bullet-proof. It uses the same 6 cylinder engine as the same-year Nissan 300ZX (non turbo). However, the transmission is geared different than the Z and the car is heavier than the Z.
Like the Q45, it's suggested you do preventive maintenance. Especially with the transmission. It's recommended you have it flushed and replace the transmission filter every 30K.
If you're looking to do a lot of aftermarket mods - especially performance - this may not be the car for you. There is almost no aftermarket support for this car. After all, it had a somewhat limited production run (1993-1997 if I'm not mistaken).
For me, the car has been trouble-free. I have a '95 model (bought in 99) and most repairs have been minor (DIY) stuff. There are some common issues with the car but they're easily fixed.
You can check out my web page to see the types of issues common to the J30 (
http://www.fuzzycats.com/j30_diy.htm ).
Likes: Interior, ride quality, reliability.Dislikes: Wish it had a bit more power. Aftermarket support.
The best advice would be to go test drive a few and see how you like it.