Not impressed with the 96xx series at all other than you can use them (and they actually work) with Asterisk. You still can't program spare buttons, etc., but * and # codes work, the MWI works and its a decent speaker phone. I wouldn't buy it over an Aastra but if someone handed you one, you can use it. You also have to do customization of your DHCP/t*f*t*p/HTTP server to have it load correctly due to changes in the option settings where it expects files to be.
Compared to older Avaya proprietary phones, this one is sleazy quality, sounds tinny when you grasp it and is basically about the quality of a Grandstream phone.