I got rid of the hackle after I read about the Go2prince in a magazine a year or two ago. It's a prince with a very small white poly wing. I found that I don't really need the hackle to catch fish with the fly.
I agree Jay. I've been using the hackle-less nymph for a while now, and they have been productive for me. I have also thought that the hackle might not get the nymph as deep in the water column. I just wanted to make sure I wasn't missing out on something.