I just purchased my '01 a few months ago with 57k miles and it now has almost 60k, so I'm in the same boat as you. My seller was the original owner and had all previous service records. It had recently had a new 12v battery installed, new front brakes, etc. I got a great deal on it because I bought it in a market where there just wasn't a lot of interest in the Insight.
Anyway, it's been totally trouble-free in the short time I've owned it, and just a pure joy to drive. The lmpg on the car is kinda low compared to some people around here (around 4

but the prior owner did mostly city driving and didn't really drive for economy. But I easily get 60 mpg on long hwy trips without even trying and at speeds of 75+ mph.
In short, I don't think your have much to worry about if the car is clean and well-maintained. But fire away with any specific questions if you have them.