i have never ordered from them but have been around many 40x rifles. If i was going that route just go to a custom rifle builder. you would probably get better workmanship and have more options. You may find it hard to believe there are custom rifle builders out there with better equiptment than rem custom shop.
basicly what are you looking for as custom work? I know at one time there was a lot of happy guys with there 40x but i dont know if you had to take what they had or you could tell them to tweek this and that.
It's over a year for most of their models. It is better to find one already done on gunbroker or something like that. There are plenty of them out there right now. Just curious now, what model are you looking for and what little extras are you thinking?