I've just replaced my BT010's with BT020's.
My rear 010 was new this spring and I only got 12k by the wear marks. I finally ditched it at 15k where it had long since gone totally bald. Except for the short life it wore nicely...right to the bitter end. The front 010 was put on last Sept/Oct and replaced at 20k. It still had tread in the centre but was well past wear marks on the side. No cupping but heavily triangulated which made handling a nightmare (which is why I finally changed it).
I can't live with new tires every 2 months so decided to try the 020's.
My first impression is they have noticeably less traction. I had trouble doing stoppies when playing around in the parking lot. Just as it would start to lift the back wheel I could feel it slipping...any more brake would lock the front wheel. The skid marks were about 8 feet long...my friend said she couldn't see the wheel lock until the end which is consistent with the slipping I was feeling in the first part of the skidmarks. I'm not saying you can't do stoppies with this tire, I'm sure someone with more "stoppie skill" probably could but it definitely slides easier than my 010's.
Fully leaned over to scraping wasn't a problem, no slipping.
The tire reacts to "tar snakes" and uneven pavement much more than the 010's did. Also it reacts to trail braking more noticeably than the 010's did.
Over-all the tire handles reasonably well...I'm just not enthralled by the traction so the 020's had better last a lot longer than the 010's!!!
Maybe next time I'll try a 010 on the front and a 020 on the back...although the tire profiles are quite different so it may not handle well.
Anyway, I'd be interested to hear how others experience compares with these tires.