I had an Engel 45 for 5 years in my 84 Custom Westfalia which we lived in for 3 of those. The engel was great and went with the Westy when it sold. My needing a new fridge coincided with the OJ Fridge comparison. I wanted and still do want the National Luna Brand Fridge, but at the time didn't have the dollars to buy one. I bought a Waeco 50 Litre fridge based on the review and low price. We've now used the Waeco for several 1-2 month trips all over Baja, Mainland Mexico and Belize. I must say that I love the "Turbo" button which cools the fridge down very quickly. I also loves that it holds approx. 10 more cans of beer than the Engel did. As for battery consumption it is on par with the Engel, if you have a dual battery system you can go several days without deploying the solar (although if you have it why not keep solar out everyday). I keep my Waeco on the 3rd light always and this is my perfect temp setting. The only bad thing I can say is that the lid is total junk!!! You cannot ever set on it or you will break the corners off that hook the lid to the fridge!!! I need a new lid and a bag, but don't know where in the USA to get them. As for vibrations and the toughness of this piece of equipment I can say that my Waeco was strapped into my AT trailer the last few weeks as we ran the entire Baja 1000 trail all the way to La Paz. We traveled a little over 1000 miles off road and had no issues with the Waeco. We also had 3 National Luna fridges with us and they didn't have a single issue eithor.
I hope this helps someone who wants a great fridge, but just cannot afford the National Luna!!!