Had my first race meeting with the controller a couple of weeks ago and got my first TQ and A1 with it on profile 9 in 13.5t, so it is very competitive.
I have run an SPX stock spec and have driven a SXX stock spec and it is faster but a lot smoother, which seems to let you feel that limit of speed Vs corner grip that the others are lacking. There is still a lot more to get out of the controller but mode 9 in stock class is 90% of the way there for me.
It worth noting that in the back of the instructions (you'll know what i mean when you read them)
there is a way of changing up to 30 different settings just with beeps, flashing lights and button pushing. Not all of those settings are working in the latest update and personally i wouldn't attempt in encase of changing the wrong thing and getting lost.
Extras you need for pc is software
and USB adaptor
, Or just search GM7168.6 Genius USB Interface Cable.