My charger for my late-2006 white MacBook broke recently. Not wanting to spend $80 on a new one, I purchased a cheap $20 one (http://tinyurl.com/mvtkna) from eBay. I of course made sure that it is compatible with my laptop, and that it is a replacement for the exact charger model I have. The feedback pertaining to this charger looks to be very good. However, it is obviously not an original Apple charger. Would it be safe to use, in your opinion? Has anyone tried to use one?