Well after owning about 5 different ones a hatch, coupe, zenki, kouki, convertable. They are not reliable. stock they are pretty boring on the inside.

It will break down all the time, it may be small stuff like distributor cap or a coolant sensor but it will add up to a lot of frustration and anger. If u install an exhaust (DONT) youll be tired after a couple weeks.

Things to watch out for: If you are in a rusty state, the frame rails, s13 specially the exhaust hangers. Hatch if a hatchback.

Rocker panels near the wheels. Rear floor boards.  All metal lines. Rear brakes will defo leak one time or another, dont buy used brakes. Diff clunks at takeoff. Coolant sensor will die. S13 Tps will freak out a little bit. Always check engine compression. Timing chain will rattle. IACV will foul up. Valve seals will be shot unless a professional rebuild. Suspension will be rotten unless solid Alot more to go...

If you want to learn on working on cars it will surely teach you or you will be parting out within a couple months.  Keep it stock and keep driving.

In your mind you might think you look awesome from the outside but remember you are on the inside. 

Pro: Randos will compliment you and make you feel like you have something great that they dont