Well, I gave up on FlyQ today.
It's ALMOST there, but there are a few too many bugs and limitations.
It seems to have some form of VNAV planning, but it loses it anytime you make any changes to the flight plan. I'd like to be able to declare start and end, set my altitudes, then add an intermediate point to avoid hostile terrain, and have it recalculate. I like the idea of having multiple kinds of waypoints, such as a fuel stop, but it has to be easier to edit for that to be useful. I'm not sure there is any way to make a VNAV flight plan including climb and descent points that has a flight track other than a simple straight line.
The weather briefing is virtually identical to duats.com, and is not searchable or indexed. For a VFR flight, I really don't want to scroll through all the FDC NOTAMs for neighboring airports along my route.
Foreflight has a VERY nice feature that notifies of an FDC NOTAM when a specific approach or arrival plate is displayed. That's really useful as a backup.
There is no way to look up a specific airport operator's unicom frequency or phone number. Many airports have more than one unicom frequency, and I can't call for fuel without looking up the number over the Web (say, on airnav). That's a glaring hole.
Flight plan workflow is odd, especially using the SAR features. As an observer, the first thing I want to do is get to the search area. Then I want to "box the grid" to see what terrain and obstructions I have to deal with. And that's always at a higher altitude than search altitude... And all this requires user waypoints, which are clunky at best. Now, Foreflight's user waypoints aren't all that good either, but it's easier to make them.