I've been using it on an old original iPad mini for almost a year now. I like it and seems very intuitive. To make it easier to see position, airspace, and traffic, I tend to use the maps in vector mode instead of sectional mode. I've heard that the iPad display renders better resolution graphics than the 740b, but wonder if overall the 740b has better contrast and brightness in a bubble canopy environment.
Btw, I pay for an annual VFR subscription. There probably is a short free trial period. However, the app is not free.