One of my friends bought one recently. I was there when he unpacked it, opened it up and took a look. OK job, nothing spectacularly wrong, but not like the meticulous professionalism with wire management and layout I've seen on other high end PCs (or the ones I've built for myself). Compared to boutique builders, it's much cheaper, I was astonished at how little this PC cost. I added up the parts on Newegg (including all current sales) and a 1:1 comparison, my friend came out about $80 behind on a ~$1600 PC (he said he started with one of their deals and changes the config a little) - but this came pre-assembled, overclocked and tested. They included boxes and warranty info for the major parts - they even packed in the original fans since he ordered silent fans. Unlike other users comments here, this PC came pretty well packed, the inside of the case was padded with foam and it was boxed pretty well. Again I've seen better, but I'd say unless you were very unlucky this would have survived being mailed 9/10 times.
Reseller rating is pretty good, so I expect they are not crooks. Sadly I think the case my friend bought was pretty crappy and made it look more like a $400 PC than a high end. They do have an OK selection of cases and parts (but heavily skewed towards cheap, gaudy florescent lit models with side windows), but make sure you run a comparison through newegg to see if they are crazy over-charging on any particular item. If you are not experienced with building your own PCs (and really building a PC will take a lot of time and requires care in parts selection) then this is a viable option, IMHO - it all depends on what you're looking for. Personally I love the really high end OEM cases like the Mac Pro, XPS 7xx series cases, the HP Blackbird case, etc. I have a Lian-Li as my home workstation case. I wish some of these 'custom build' manufacturers were able to provide comparable high end case options.