Is this a decent company/motor to use?

I don't know a lot about the electrics, but I know Frank Cadem of Five Flags is a stand up guy. I'm sure he'll steer you right.

That being said, I've tried a couple of different electric kits and was less than impressed with their performance and the weight that the battery/batteries add.

It's been a year or so, so maybe they have made some advancements in batteries? I'll have to go check out what Five Flags is offering.
If you want light weight and extended range/performance you have to pay for premium batteries. I've heard good things about fiveflags so I'm sure they don't sell garbage.