we did TWENTYS last year...granted was a very cheap price and apartment was excellent but we arrived in ibiza about 4am in the morning...by 10 am the same day they were knocking on the door to get you to come to the welcome meeting!! SSEEEEEEE YAAAAAAAA!
Avoided the lot of them for the rest of the week and then on the day of leaving they couldnt get us or the rest of the people leaving that day out of the apartment quick enough!!
Luckily,unlike the rest of them, i didnt pay an extortionate ammount of money on excursions to be treated like yesterdays lost luggage when it came to leaving.
NEVER GO TO THE MEETINGS! NEVER PAY FOR EXCURSIONS!
DO YOUR OWN THING ALWAYS!