I'd have to say any positive reviews are faked by the company. OpenSky is a poorly managed marketplace web site with little to no customer service to offer. I know most negative reviews are made in spite of a company - and I try my best to leave both positive reviews when I have a good experience, and usually give a store the benefit of the doubt before leaving a negative review, but I feel a certain obligation to inform the public of OpenSky.
I bought a simple, low cost, T-Shirt as a birthday present for a friend, and tracking has been sitting as "Label Created" for 2 weeks now. I thought I was placing my order far enough in advance for any carrier service to get the package to me on time, but the package hasn't even made it into their hands.
Of course, I read the reviews of OpenSky before purchasing and was skeptical about using the site, but it was the only place online I could find the product I am looking for.