We stayed at Eweleaze last year (we only live a couple miles away!) and TBH I was not overly impressed. It poured the whole time we were there, which I accept was not the owners fault (I confess we decamped home at one point so the boys could play the Wii and keep at least one set of clothes dry!) and the place seemed quite randomly set up, as mentioned above perhaps a victim of its own success?
The shops were well stocked (when they were stocked- its only one month FFS, how hard can it be) but expensive. There was also a lot of stuff that was labelled "multipack only" which means they are buying in Tescos and splitting the boxes, then charging over the odds for it- tut tut tut! Good choice of food, but also very pricey and often sold out. Shower blocks reasonably clean but nothing to shout about, toilets basic, and yes, the boys were FASCINATED by the composting toilet (FWIW it was not too bad. I believe in giving anything a go but did traipse miles away to an uninhabited corner where I could savour the experience in privacy :o)
We also stayed at a sight near Kimmeridge whose name escapes me at the moment. Very basic but completely back to basics camping with a price to reflect this. Allowed campfires and pretty much anything else so long as it did not upset anyone else- thats my kind of camping :o