(the webpage is expohills.com) since it is hard(i don't know why) to find on google.
I'm looking for someone with an account there that can solve some questions of mine. Thanks.
Judging from the majority of reviews of some site checkers around, there are lots of reason not to used this exchange.
Yes we can already conclude that it's not trustworthy.
Anyways, what are those questions of yours that needed to be solved? If it's about legitimacy, then all you need to run is your "common sense".