Bought 6 laptops from them, 4 of them had the serial numbers scratched off for god knows what reason. I couldn't fault 3 of them so it almost seems like they do it on purpose so you have to scrap them instead of fix them and resell them.

Be very careful what you buy from them, if a laptop or desktop says it's faulty do not buy it no matter how good you are at fixing them unless you are happy to sell with scratched off serial numbers. The numbers are available in the BIOS anyway which makes it even more pointless.