I love this jeep. It is easy to work on, a little bumpy but, hey its a jeep. I have no problem going 70mph on the highway at 3000 rpm's. The clutch is smooth. Mpg's aren't bad for a jeep I do have a cold air intake I installed myself in less than 2 hours. I would recommend this vehicle to anyone. My girlfriend has an 04 Rubicon. She calls my jeep the girly one but, honestly I like driving the Rio better.
Fun to drive. Easy to work on.
For me it's none. But remember always check for rust