As Neil said, go for good quality second hand stuff from reliable sources. Personally i've never heard of a Cyber10b (doesn't make it bad) so I can't comment on what it's like but I certainly don't know anyone who's got one.
There's normally a few good bargains in the For Sale section on here, if you're not sure of the seller there will always be someone who can tell you if they are genuine or not.
Hope that helps
