I own a 2001 GMC Sonoma SLS, 2.2L 5spd Reg. Cab with the short-Stepside bed. It's a great little truck, a bit on the small side if you're a bigger person, (I'm 6'3", 280lbs) but I still seem to fit in there alright. It handles pretty well in town and it's easy to park because of its size, but when you're traveling at high speeds or going down windy roads, you can tell it's a light truck. Repair bills aren't usually too steep because the Sonoma shares parts with the Blazer, Jimmy and S-10 so getting cheap parts is easy. All and all, it's a pretty good little truck.
Good MPG (I get 20 city - 25 highway) Easy to park. Ease of finding replacement parts. Fun to drive. Good head room. Lots of power-jacks in the cab. Great heater and A/C
Make fuel tube to the tank wider. I have to basically let fuel trickle into the tank whenever I fill up. Remote locking doors would be nice. Electric windows would be nicer.