Neilson - Anyone been to a few?

[longshot]

So we have been to Vounaki & The Retreat and one in Turkey which is now closed...we loved Vounaki and the Retreat but the weeks we want to go next year are full, actually we can go for one week but ideally wanted two weeks...

so the choice is:

Messini
Croatia Alana
Lesvos

All their other resorts are full / unavailable from our airport. They are all of a similar price. I am slightly worried about the weather in Croatia (May / June) otherwise that would probably be may preferred.

Anyone been to any of these and keen to let me know how it compares to other Neilson resorts?