No mechanical problems as yet.
I've had my Megane Sport for just over one year now and don't really have any complaints.
Very pleased with the engine. It's got some decent low-down poke, but also quite economical.
Handling is fairly dull - a bit too much body roll, but the brakes (ABS) are good.
Interior fairly spartan, but at the price it's a lot of car for the money, and I was more interested in getting a decent engine. No air con which is a bummer.
Invested an extra couple of hundred quid for the 6 CD autochanger - well worth it, and the stereo is MUCH better than the one in my Xsara Picasso.
We bought ours for just under 9k from Arnold Clark, Paisley. Nice, friendly sales guys, but (a familiar story with most garages) there's room for improvement in the service/repairs dept.
Replace the shocks, with gas shocks - and you should find the handling of the car is more precise.