Rossi pipes do have the possibility of a problem. The Rubino series, at least, have a clear coat instead of a wax finish. It makes for a pretty, smooth pipe finish, but if the pipe gets remotely hot it will bubble off. Rubbing with acetone fixes this, but beware it will remove some stain and the shine. Pipe can either be re-stained, waxed, etc...
With that said, my Rossi is quite the workhorse. I've used it more than any of my current pipes, and it works wonderfully!