We were at the All Day I Dream opening on Monday.
It was our first time at Playa Soleil. The crowd was friendly, if quite a bit more "beach club posh" than at the ADID parties at Cova Santa, and a bit less Ibiza hippie vibey.
To be clear: the club/dance floor is entirely indoors with big glass windows. (It's probably possible to open them up, but everything was firmly closed when we arrived around 20.30.) There is a bar outdoors, as well as seating areas. The entrance to the club is from the beach-front, so you will need to walk a few steps in the sand.
After eleven the party moved further inside, it looked cool, but we didn't stay for long after that. We definitely prefered ADID at Cova Santa, there's something magical about organic house in a beautiful outdoor setting. But I don't want to be too negative, after all: it's a free party with a lot of good DJs.
Also: they broadcasted live on Ibiza Global Radio between 21.00 and 23.00, and will do so every Monday the whole summer, so there's a chance to take part even when not on the island.