FX sails quotes very favorably over the mainstream lofts, so the idea is tempting. Delivery times are similar as well, at 6 - 8 weeks.
I'd also be most interested to hear from someone who has gone through the process from start to finish. A concern I would have is with the fit. Ordering on line means the sailmaker is not going to measure your rig. Not all "standard" boats are the same and it's quite possible that the sail will not be a perfect fit if the measurements provided them are not spot-on. I'd then be interested to see how interested the local lofts are in helping you out...