They're a tough truck and not overpowered so no dramas with driveline. Manual is a better choice than auto which loses a lot of performance.
Engine is classic Mitsubishi 6G7 series - they have noisy hydraulic lifters (not a problem, just tick, tick tick; No, not tick, tick BOOM like the MN) and they can consume petrol at a rate greater than Saudi Arabia can produce it. But, driven a bit easy they can be surprisingly economical. Usual clacketty-clack when cold starting until oil pressure builds up. Again, no problem - just get used to it. Timing belt needs to be changed every 100,000km which is not unusual but very important in these. Your mechanic will hate you after you get him to do it since access is difficult and half the engine needs to come apart to do spark plugs at the same time. Once done, good for another 100K.
Compared to modern vehicles they are a bit agricultural but, in the GLS that I had, all the basics were there.
If going offroad and likely to encounter more than just a puddle then it's a good idea to fit a snorkel since the fan flicks water straight into the air intake. Ask me how I know and how expensive a rebuild is. That said, that tough little thing ran for a few weeks with bent conrods, damaged valves and main bearings that had gouges bigger than can be dug by a Bobcat. I know of another that drove from Adelaide to Sydney with similar engine damage.
Electrics and computers are simple, so doing mods is not difficult. Despite the weakness of limited front suspension travel it went pretty good offroad. Torsion bars can be wound up for a little more lift and there are aftermarket ones available. A Lokka would make one of these a weapon. Squeaking rear leaves were not an option - these were introduced by Mitsubishi in the ML.
Tub in the dual cab is quite a good size, being much longer than the ML but overhangs were not a problem. Steering lock was roughly the same as that for the Queen Mary.
Brakes were, ummm............ok. Just had to make sure that the rear linings were always adjusted right up.
Paint quality was a bit doubtful. By now it should have all peeled off, so no problem.