For power, I have this great dual-battery setup:
View attachment 2333587
But seriously, I was gifted the Rockpals 500 awhile back along with a Rockpals 80w portable solar panel. The Goal Zero Yeti 500x is a recent purchase, again taking advantage of the REI member coupon. We haven't really used either one very much so I can't say much about them. The build quality of the GZ is clearly better, but the Rockpals isn't bad at all. The handle is not as substantial which might concern me if it was being carried around a lot. Seeing as how it will mostly be stationary, I am not overly concerned.
In a completely unscientific test in my garage, I put a 1 gallon jug of tap cold water in the Dometic fridge which was plugged to the 12v port of the Rockpals. I set the temp at 38 and left it for 12 hours overnight (6-6). The next day, the meter on the Rockpals showed 92% capacity remaining. I didn't care enough about it to do any actual math, and the conditions were not representative of actual use so it was more or less meaningless, other than proving that the fridge and battery worked.
Upon receiving the GZ, I attempted a similar test for comparison, but it turns out that the GZ can't power a fridge via the 12v port without an adapter. Do the kids still use the phrase "What the actual f***?" these days?
Rockpals - 1, Goal Zero - zip
The Rockpals 80w folding solar panel is a very nice bit of gear. It's very compact and appears to be very well constructed. It also came with every possible adapter that a person might need, including a Goal Zero adapter.
Rockpals - 2, Goal Zero - zip
I'm sure the GZ has many positive aspects that will reveal themselves as time goes on, but so far.....