To clarify: 'Custom', as it applies to bikes, usually refers to a bike that was built entirely with an individual in mind - frame included. You can also have a 'custom assembled' bike built with a specific selection of parts on a stock manufactured frame, or a bike that has been 'customized', but neither of these is often referred to as a 'custom' bike.
While the one you posted looks to be a pretty nice bike, there are some weird things about it: First, it appears to have older friction-only shifters - this is not a bad thing necessarily, but a little bit odd. Also, the chain appears to be too long, which makes me question the skill and knowledge of the person who built it.
Also, there is mention of a dent, but I don't see it in the pics. That could be a deal breaker depending on the size and location.
However, if the dent is not serious, and the bike fits you (I would guess this is a 56 or 58 cm bike for someone between 5'8" and maybe 6'... maybe a little more of little less) then it is not too bad a deal.
Edit: Also - it is not a '600 group' - it has 600 brakes and derailleurs, which does not make up a whole 'group'. It has lower quality wheels and hubs, Suntour friction shifters, a mystery crankset and (I think) brake levers.
Last edited by LarDasse74; 09-10-12 at 10:17 PM.