Product review (5 stars): Best investment for a cooking trucker
Love this freezer! We spent the extra money and bought the FM-452SG so it would fit in the cabinet in our Freightliner Cascadia. In less than an hour the freezer went from 69 to 22. It's whisper quiet, you won't even know it's on unless you look at the digital display. When you plug both AC and DC in, the unit will automatically switch if your AC gets interrupted. It's a bit heavy, but very well built. When I received it, it was dented on the louvers, but that happened during shipping and doesn't hurt it's performance.

Update*
I've had this plugged in for over two months without defrosting it and it still runs like a dream. I've had the power off for over a day and it is still below 0 when power is restored. Best investment I've made! Now I can have raw chicken and not worry about it being spoiled before I cook it