Been using twinhead 121D for 3 1/2 years now. No problem whatsoever. last march send for repair since my laptop always shut-down after 1 minit thay charge me nothing since it still under waranty. Even after i open my notebook. Service ok. The problem lies in fan (never clean it before) and RAM (kingston) but when take out the RAM, no problem, they even screw back and oil my laptop.

Well, it all depends on luck. Nothing is 100% ok.