TM KF engine worth it in 2024?

A friend asked me to find a kart for him and I found a listing with a TM KF engine (doesn’t specify which model). I haven’t really heard about these engines in a long time, are they still worth it regarding maintenance, spare parts and performance? I would normally look more into a Rotax Senior Max or X30 but that deal is really good.

If it was a couple hundred quid, yeah because it’s worth it for a hack around, but I’d avoid if anything above that.