have had one for several years. I find that clean up is time consuming if the project is a single room or smaller.
For multiple rooms or a whole house, it's fabulous. I would think for your applicaton, it would be darn near perfect. It would save you countless trips up and down the ladder, drips between the pan and wall, and all that mess.
Clean up is basically run water thru it until it's clear. Not difficult but it can take some time.
As a compromise, I bought a Paint Stick that uses a hand pump to fill the long handle with paint, saving trips to the paint tray. For a single room or less, it's better than either a regular roller or the power roller.