its alot of things, the boardsa are laid out nicer than GGG, plated thru holes, nicer parts, nicer jacks. better custy service, better support on non-working builds etc etc etc. but it all does boil down to the guy whos assembling it all. ive been getting almost alll my boards lately from my buddy Barry at guitarpcb.com he has got a TON of boards to choose from but they arent as friendly as the byoc boards, thats for sure, they are for the intermediate or higher builder id say, just because the layouts are tight, and there is some real tight spacing on them. however they work flawlessly,and the price is right, and barry is a great guy to deal with, every weekend he has some crazy sale going on like spend 15 bucks and get a free board or something