I have a CFX and I'm very happy with it. They seem very well built, don't pull a lot of current compared to engels, and I've never seen mine more than a single degree above or below set temp. Speaking of set temp, you can set a CFX, and most fridges, to the exact temp you want, and they'll tell you what temp they are inside, while engels just have a knob with arbitrary numbers on them. If you want to know what's going on inside you have to buy a thermometer. And like sharkcaver said, engels are very noisy. My old man's recently bought 50L engel makes far more noise than my 95 litre dual zone CFX, and draws about the same current.
I also have a 50L sphere that came free with my camper. It's on the cheap end of the scale and it shows, the thing gets a full 5 degrees above set temp before the motor kicks on, and it shuts off right at set temp, so for keeping drinks cold on day trips I set it to -2 and figure it averages out to just above zero. I do like that the lid opens from either end and can be lifted off completely. It would work if a freezer was all you wanted. Set it to -20 and it's not that big a deal if it gets to -15. Worth about $800 new I think.