NGK AFX is fail in my book. IT is essentially useless for part throttle tuning unless you have the ability to use an alternate ECM input to datalog A/F or perform the 5V mod on the O2 input.
I have used two Innovate LC-1s for probably the last 4 years. I recently brought my first one out of retirement because I thought it was dead. Turns out, it was just a wiring fault. I bought that fucker shortly after they came out, it has been permanently installed in 4 cars now, the serial input cable has been cut, then repaired by me, and it is still ticking. With all of the BS I have read, the two that I have bought have served me very well.
Those are the only 2 I have personal experience with, adn the LC-1 wins without a doubt over the AFX pile of fuck.
I do want to get one of Alan's JAW units to try out one of these days. Just don't need another wideband at the moment.