I was on 3.4 before 3.5 - 3.5.0.0.808 came out a week or so after i purchased the vSZ.
3.5 has a completely different look and feel to it, my upgrade took a couple of hours to complete however it does seem a lot quicker.
I've asked my reseller to look into the AD problem too but they came back with creating a rule and force them on to a specific VLAN, this is not what i want to do, i'm wanting to stop a specific group in AD from being able to connect to a SSID.
Here are 2 screenshots of 3.5 - the login screen and the home page which can be customised.