Yes, 6 or 7 prior custom shirts from them. I've been buying them since before they were a SF Affiliate. The fit was pretty great after the first one, which was still good. They are quite well made, IMO, especially for the price point. They tend to cut their custom shirts pretty slim, though, so let them know if you want something roomier.
The only downside to having a lot of custom shirts is that if you gain weight there is an abundance of evidence that you've gotten fat.
I agree that they are well made, especially considering the price. I find the buttons to be whiter than the MOP on my RLBL though I prefer the hand of the RLBL and the Jack Lipsons I have a little more but even on sale they are more expensive. I'm glad to hear that they cut their custom shirts slim as that's exactly what I'm after.
On the topic of MTM has anyone tried Suitsupply MTM? There doesn't seem to be any RTW suit in a fresco or hopsack with natural shoulders, minimal lining, really light canvassing/unstructured, and minimal lighting. If anyone knows of any RTW similar to that I'd definitely be interested in checking it out.