Hello
Yes its compatible... but you need a minimum firmware of 5.0.4.2
Yes the disasvantage is that the lastest supported release is release 5
As far i remenber the end of life of this product for support is on 2016.... after that you will not have support...
This is an old controller i recommend you get a new one
You can check yourself that info on the relase notes of the ap 93 and on the end of life list on arubanetworks page
Hope it helps