My recollections of the MT125 from a long time ago.
Somewhat under powered, good brakes and it handled very well.
Looking at it from now at an older age and less concerned with racing one I think it would make a good vintage trailbike.
Good handling, good brakes and reasonably light. The lack of power probably wouldn't be a problem as you could just hold it open and it's not going to try and kill you or wear you out