I used them this year for my coop but it was for a custom hybrid I got them to make, but it was converting a standard turbo so sort of similar. For what I had done the price was great and they did what they said they would.
They did take a bit longer than I wanted but they had quite a bit of work to do and so far not had any issues reliability wise, aside of an issue with the wastegate adjustment but was a easy fix. However I have only done around 1000 miles on it so hard to tell if it will last.
They responded to all my questions and were pleasant so I would use them again in the future.
I wouldn't have thought there would be a massive difference with the 11 blade wheel over a stock one but should be stronger than a standard core with a bit more midrange. I am sure someone on here has used that CHRA which would be able to give you a better insight to what any gains felt like.