Anyone has bought one of these? I'm afraid that they are cheap counterfeits, that would catch fire like the first models (without the green dot) did. However at 2$ the deal seems too good to be true, and I guess it's not that expensive to produce, hence the availability on ebay. What makes me suspect that it could be a cheap knockoff is that there are lots of others (this one, for example) that sell the exact same, using the same exact photo (coming most probably from Apple). They all seem to have good ratings, however. Any opinions?