I am seldom interested in a pure custom, although I have owned quite a few over the last years. I presently carry a mid-tech, which is an "almost" custom and "almost" production, and for my use...that seems to be working out perfectly. I've carried the same knife for about 17 months, and that's some kind of record for me. But as has been said, there are so many FINE production knives these days...and you will save a bunch of money in buying them over custom.
If you want to incorporate some of your own ideas or measurements into a folder, then buying a custom can make a lot of sense. I have done this several times, but found out that they weren't all that great either. Which doesn't say all that much for my ideas...
If you wish to buy a "name" and that's fine, then you may not have much choice. The cost factor is often two-to-one, or much greater, and I'd rather pay the lesser amount. I am not that impressed by any custom maker's name...but that is all opinion, and many will disagree with me.