I have had two dometic chest type fail at 2 years (right after the warantee), but Dometic gave me a new one anyway--it also failed. I have a Norcold, chest type which is only 12 volt and it is 6 years old--not used a lot, but works fine. I had another Norcold which lasted 13 years of almost constant use. For the buil in--I have had a chest type on roller slide out treys under seats, and the front door opening type. Both seem to work equally well. I prefer the chest type. More effecient--don't loose as much cold when the door is opened.