I use one, and so does Ron Stewart and I am pretty sure Kirk Wennerstrom uses one also. I have mine mounted to the instrument panel right above the radio stack. It is very reliable and as far as subscription and updates it gives you the BEST bang for your buck. They are also a long time sponsor of the FLY IN.
I also know that at least one of the two Naval Aviators uses the iFly 740b. (His initials are Jim Campisi).
Ron "20"
A&P/IA
1976 Cessna 150M - N820ST St. Charles Regional Airport KSET
Fly Safe... Fly Often...
Super Bowl IV - LIV - LVII - LVIII CHAMPION Kansas City Chiefs!