Welcome to KF !!!
I would only talk to the guys that are in your aria, that you will
be kiting with ; their the only people that know what conditions
you'll be riding in , with your weight.
Another thing to get NEW , is the lines that attach the bar to the kite.
Before you buy used ; do a KF search on the kite in question, and make
sure it doesn't have problems , (like leaking bladders) or valves. My
first kite was an Ozone instinct, back before the cave-man ; i never
had to replace a bladder , (Ever) on any Ozone kite i ever owned , but
when you search check, you'll find a LOT of company's, have a LOT of
problems or issues with their product, (even Ozone, on some products)
Do a search FIRST ; see what happens.