I have quite a few flights on mine and really couldn't be happier ! My first couple of flights I stubbed it on a landing and I had to re glue the one fuse former that's just behind the gear plate. I could flex the gear and see the whole former came loose,really my fault not EF's!!
I'm using Turnigy 4s 2200 and getting 8min. tops just floating it around. Doing multiple climb outs for spins and such I'm getting 6-7min. The 20c seems to be plenty --I don't think 30c would make much of a difference the vertical is insane! This is the best Harrier plane I've ever had zero wingrock --first plane to give me confidence to harrier land and hover on the deck!!
If the 78" is anything like the smaller brother,it's going to be a great midsize plane for banging around!