Re Flightstar
Must admit to being biased as I do have an Xair but am really happy with it.....420 or so hours. There are about a 1000 flying around the world, and they are pretty docile. I looked at the Flightstar, also very nice. I can't comment really on the load issue b/c for us the Xair is great for buzzing about, and does the job. The main reason that moved on from Flightstar was that here in Oz there wasn't a dealer, whereas Xair does have one - parts are easy to get and there are quite a few flying here so support that way is good too. There is also an online group (Yahoo) - maybe you could get them excited an ask your question to them - yep, they love the Xair too so will be biased but maybe it'll help you decide one way or the other. Xair Ireland might be able to help (Google search for them). either way, good luck and enjoy your choice.
Cheers