Yes, I have the Lone Wolf 9mm conversion barrel and a Storm Lake 357sig conversion barrel for the G27. Also I have a Storm Lake 10mm conversion barrel for my G30. All have been reliable with about 100 rounds cycled through each. Remember, the 9mm and 10mm need their own magazines, 357sig works fine with a 40cal magazine.
I only got into this because of the 0bama effect on ammo the last couple years, wanted access to what may be available in a crisis. /prepper
I like the 357sig better than 40cal in the G27, less snappy and a faster round. But 9mm is still my preference.
Also, now I have to start shopping for 357sig ammunition, which also seems to be in limited supply. I love a challenge.....