@chrisbi The Instant ON AP's will not support Dynamic VLAN assignments. If you require this then looking at Aruba Instant Access Points would be the direction to go.
This is a huge omission for those coming over from Ubiquiti access points.
I understand the business decision to keep the distinction between the product lines however this actively prevents the product from taking that marketshare away from UBNT as those requiring this particular feature (and there are a lot more of these users than Aruba realizes) will stay with the other guys.
This is a shame because there's a tremendous market opportunity to take these SMB and prosumer customers away from UBNT in general - it's been communicated to us at every turn that this is the intended market for these products. If this is the case, feature parity is very important, at least on those features which are often used like this.