This is a neat little interface. I wouldn't take any stars away from it for what it is. I like that the plug locks into my iPad so the weight of it can dangle without coming unplugged, the cables (two for both iPad plug formats: older and new) are plenty long, and it seems like it delivers a quality signal to me. Lot's of headroom!
I bought one of these for exploring the ever-growing choice of apps for acoustic guitar signal processing (EQ) and amp simulators on my iPad Air 2 for on-stage use thinking the slight latency of the iPad processing wouldn't bother me, but I was dead wrong. If you can hear both your guitar and the processed signal, latency is enough to be very annoying, and even a little annoying when you can't, especially on faster playing where you need a more immediate response to stay in the groove. I think I'll hang onto this in case it comes in handy, though. It is pretty cool for what it is.