I keep trying, but I've mostly given up on it. I'd like to say that fixes to the app or its backend would solve the problem but that doesn't appear to be the case. The main issue I have is a near total lack of mobile signal in many of the mostly rural areas of the UK where I can get the kind of imagery I want. If I have a stable 3G or better signal I'll give it a go and it'll work more often than not, but any less than that seems to be a non-starter and I often have one bar and/or GPRS on location at best.
To make matters worse, I'll often react to changing weather and light conditions as the day goes on and change plans accordingly. That means that while I might be able to give a general area where I'm planning to be on a given day while I do have a signal, those plans can change significantly at the drop of a hat, and I might not even fly when I get there and shoot with my SLR instead. Realistically, there's not a great deal of difference in usefulness between no flight plan and "might fly somewhere in $nationalpark/$county"...