Thanks for the report. Interesting on the Noise factor. I imagine the Dometic is actually just a relabelled Waeco for the North American market, and Waeco recently came out with their own compressor, so to hear that it is quiet it a big plus.
My former Norcold fridge with a Sawafuji compressor drove me nuts and I expended lots of effort to dampen vibrations and noise, with good results, but not good enough. My Vitrifrigo's Danfoss/Secop is so much better in this regard, and efficiency too.
Does the Dometic's power cord appear similar to the Whynter?
Do you have a Link to the model you bought?
Are you going to hardwire it?
Is your 12v ciggy receptacle a stock vehicle one, or one which you wired to a fuse block to the house battery?
I'd be interested to see if the following receptacle/plug combo is well built and can actually meet its 20 amp rating:
http://www.amazon.com/gp/product/B00G4RYWF2/ref=s9_hps_bw_g263_i9