I agree. It doesn't have a lot of overhead on the cooling, so it's hard for it to drag down the temps if you put stuff in there warm. It would be imperitive for you to turn the fridge on a day or two before the trip, and put all your stuff in pre-chilled. For the way we operate, that's a complete non-issue. That's how we'd operate anyway. That being said, after about 36 hours, it had dropped the temp of all that water, I'd say about 30L of water, down to a pretty cool temperature. That was with it stored in our house, about 24C.
So, we went on our first weekend trip with it. We are pleased and will be keeping it. It was so nice being able to load the fridge before the trip, then just pop it in the trailer the day-of. No need to pack it last-minute as you do with a cooler. We were easily able to get enough food in there with for the family for the weekend, and that included some blended baby food that was not packaged very efficiently. (I only noticed afterwards that my wife had put individual meals for our daughter into little square containers that were only 1/3rd full.) Once we're out of the baby food stage, the unit should be fine for 4 days at a time, if not more, used carefully. We had 2 litres of milk, 1L of juice, 4 beers, 4 cans of pop, 5 italian sausages, 3 hotdogs, 7 strips of bacon, a block of cheese, some margarine, and all the baby food.
We did put left over cooked pasta into the cooler on Saturday night. I put it in a container, let it cool down to just a little more than ambient, and put it in. Sunday morning, it was cold, and nothing in the cooler seemed to have suffered. In fact, by Sunday at lunch, running on gas all weekend, everything was VERY well chilled. We had pop on Sunday at noon, and it was really cold. And this was during... pretty much the warmest temps we see. About 29C. 31C would be possible around here, anything after that is record setting.
The only issue we had was that on Sunday, we packed up camp and stopped at a beach for the afternoon. I don't have the cooler area in the trailer wired for 12V yet, so I had to put the cooler in the van while we were travelling on this trip. I plugged it into rear socket in the van. When we stopped, I don't know if that socket was live or not. The van also got very hot inside. The cooler warmed up noticably over about 3 hours. It's a temporary situation that I just have to find a work-around.
The key, really, is just to be careful about what you're doing. You can't load it up with a case of beer. And you can't keep icecream. But, if you're just looking to keep your dairy and meats cold, it's fine. If you are planning on beer, just put in your beer as-needed. Take one out, put another one in to chill for the next 24hrs. If you're the type that consumes a 12 pack per day.... well... it's not going to work for you. We typically only have 1 beer per night.
So, it's not going to give you the luxury of doing whatever you want, as you could with... an Engel 60L Combi. But it's also 1/4 of the price. And I don't believe the cost comes at the expense of quality/durability. If feels very well made, and it has NO moving parts. And you'll never have to worry about running down your battery.