hello wise ones of bhm

, I've been searching all over this site and I've come to the conclusion i should just ask... I want to get this hair:
http://www.aliexpress.com/store/product/100-Virgin-Peruvian-Hair-Weave-Mix-Length-3pcs-Lot-12-24-inch-Natural-Color-Body-Wave/518460_745102712.html
(Dont want to make it clickable just in case it violates some code on this site


)
and I was wondering if the 3 bundles will be good enough, and if this looks like a SOMEWHAT trustworthy seller.. I've read that 300g should be enough ..but will it look too thin?
Thanks in advance!!!