I have used them and I will continue to use them. They work great. A couple down falls are the price for the replacement blades. You can get a pack of three new bh for 5 buck more then the replacement blades. Also I wouldn't be comfortable putting replacement blades in. I used the the blade by the way.

They do have a retaining ring but it is not like the Splitfires as far as how it is utilized. I was a little skeptical about that too but no worries.