We had them great over the winter but with the influx of temperature and not getting temperature correct they all died. We'll be getting a new colony started soon.
Pros - I think they do fantastic. You get cartilage and detail left that would be lost with boiling. Also if you have a large colony they'll clean the skull fairly quickly. Safer. Simple to keep, we used an old chest freezer.
Cons - They smell horrendous so don't keep them close to the house

.. They're living creatures so it's not really "set it and forget it" like other methods, you have to clean their substrate etc. When you're first building a colony it's extremely slow going but it'll get there.
Good luck! I highly recommend them.