A major issue with the install is the nearly inaccessible engine speed sensor connector. Find a professional or plan on frustration; Bazzaz has no insight on this point.
It does work, but the gains with my full Hindle exhaust, the Bazzaz, and a K&N filter were about 5HP. That's some major coin for a small lap time benefit.
I think the traction control works well, I had wheel spin issues before and now I'm running faster laps with no spin. I bought the traction control lamp but didn't install it; no time to look down.
A final point is that I think the Auto Tune option with the Bazzaz AFM sensor is not useful. You need to run steady state to get useful tuning and that means a professional with a dyno ($250 in my case).
If I had to do it again, I would have skipped all the expense. Almost $2000 for all the parts, labor, and running around. The extra 5HP is worth about 0.5s per lap at MO, since time at WOT is about 10-15% of a lap.
Now, if the Bazzaz added some data logging, I would call it worthwhile.