I think that the vest that I had was the Hill/Rom and I hated it!! Not only was it not comfortable, I also had a problem with itching and breaking out in a rash. The docs didn't believe me so I had to use it in the hospital one time while I was there for a tune-up and the RT had to watch me do it. About a minute (or less) after we turned the machine on, sure enough I was itching and broke out in a rash. Needless to say, I never used it again.
A few years before transplant I got a percussor from a medical equipment provider and used that. I still have it even though I had the transplant for a just in case.