I had several Berettas that I purchased from him done. At the time Mark was doing the conversions.
Excellent workmanship, top notch. If I needed another done I would not hesitate at all to contact Joel.
I've had two of 'em done at JE, very happy with 'em. BTW he also does nice soft combs, either with your wood or he will make your wood adjustable and also make a soft comb from his wood so you wind up with two adjustable combs, one matching wood and one soft.