I wanted one because I love the truly warm lather that my barber gets from it to use on the back of my neck. Then I read the reviews...it's awful enough if you're a barber using it all day, and more completely terrible if you use it once a day.
Or do you mean one of the attachments that warms an aerosol foam/gel?
I've had two. One is the one pictured, the other was similar but made to clamp on to the can. I had mixed results with them, never consistently hot lather/gel but if I tried hard I could get lukewarm. I might revisit them someday but I think now if I want hot lather I'll use a scuttle or just a shaving bowl sitting in hot water.
Seems like you would need to add a Keg in your home bar before you would need a lather machine in the house. Unless you have yourself and 4-5 shaving age sons that never left home. Hmm.... Yet I'm curious to know more and may now need one...ha ha!
I'm not trying to discourage normal discourse here on B&B, but take a look at Amazon reviews. There are multiple listings for it, each with multiple reviews that seem to do a decent job describing it. You won't find a lot of experienced opinions here, unfortunately.
I have no first hand experience using the barber shop lathering machines, but posters to past threads have seemed to indicate that they are more trouble than they are worth for the home user shaving once or twice per day.
I don't want one nor do i see any reason to have such an expensive piece around the bathroom, its just my curiosity that got the best of me with this thread.. Maybe if i had a few sons that shaved everyday, that might be a different story, but its just me. my son is only 12