I have FF on an iPad mini as my primary IFR app. I just loaded iFly on my android phone to replace Avilution/FlightPro as my backup app (I like having a backup data source as well as a backup hardware and I love my Note 2!). My wife just got a 720 for VFR use in her Ercoupe, mostly because of the bright screen. I'll have a better comparison after I've used the apps side-by-side for a while but I do like FF for IFR. Probably the best thing about FF is the dedicated airport-map-plate-document buttons along the bottom of the screen. One tap on airport - there's all the data plus ADS-B TAF/METAR. One tap on map - the map. One tap on plates - the approach. One tap on document - the checklist. Makes accessing data, particularly in turbulence, very easy. I also like the FF folders for approach charts. I can select the plates I want and put them in the order I will need them then three-finger swipe thru them. The lists of chats ordered by which ones you viewed last makes for a constantly changing list. I haven't downloaded enough data from iFly for a comparison but one of FF's string points has always been their download performance - you select what you want, tell it to download and a little while later, the data is all there. It just works. iFly's download menu is actually fairly similar to FF so I have good hopes for it. As a CFI, I also really like FF's documents. I get electronic copies of all the FAA training manuals and FF automatically updates them along with the charts whenever the FAA releases a new version. That saves a major PITA keeping things like the Airplane Flying Handbook and a couple dozen others available and up to date. Everyone has their own way of organizing things in the cockpit so each of us is going to value some features more than others. Luckily, we have a variety of apps to choose from right now.