I currently own an 850 which has modified by Steve Huntley at GNSC and previously owned an 830. The 850 has been in our system for more than 5 years and has never experienced any sort of reliability issue. I am a BIG fan of the Wadia and eagerly await reviews of the 781i. In fact, I have been hooked on Wadia products for nearly 9 years. I say, go forth and purchase the 781i (so you can tell us all how it is)! : )