The KLR250 is a basic road/trail bike (kickstart only). They were first released in 1984 and have remained unchanged since then (other than colours). I had a 1986 model and it was a good reliable, all purpose bike, never gave any trouble. If you want to go fast, or do big jumps, there are better bikes around for that. The KLR is not an enduro bike, but if used within its limits will give years of reliable service. Comfortable, by today's enduro standards it has a wide seat and soft suspension. A little bit heavier than most 250 4 strokes, and not especially powerful. It has a smooth, vibration free engine which is good on road for continuous high revs, unlike many of the opposition's bikes.
The KLR250 is a very good road bike, a competent off road bike, but not a race bike. Similar bikes to consider: Honda XL250, Yamaha XT250.
More offroad oriented bikes :Honda XR250, Kawasaki KLX250 (better in most respects to the KLR250) DRZ250, TTR250, TT350