On a similar thread, mojoputter seems very unhappy with the product.
Personally, I'm reluctant to replace a pc/server, which we can usually fix or repair easily, with a fairly pricey proprietary module.
I thought Definity Audix was great until a few of them crapped out - when they did, we were SOL unless we had spares in stock, and you can't count on that unless you have deep pockets.
I don't think the UC Module has much reason to exist, other than to put more money in Avaya's pocket.