I have had one for quite a few years now and use it quite a bit. Mostly use it for cleaning others guns but now and then on my own. It is the only way that I have found to get 100% of the copper fouling out of a bbl. I have had guys bring me a rifle and claim they spent many hours and gallons of cleaner on it so it must be clean only to find some more copper in it with the foul out. The drawbacks are that it is a slow prossess (8+ hours) at times, and kinda messy. Finding the large containers of fluid can be a problem at times also. The lead out works much faster and equally well for getting that last bit of lead out of a bbl. expecially on 22's.
Overall I like it.