Brian
I finished the upgrade and reassembled my system. I was moving it out of my music/HT room. I had to try 2 different computers my lap top would not work for some reason. It meant I had to disassemble the 990 and take it do a desk top in another part of the house.
I would guess having access may be stopping some like my self from the upgrade.

Anyway, I finished the install and reconfiguration then started looking for a movie with some good affects. I found The Matrix and Transformers were playing at that time.
There was a clear difference immediately noticeable. Even with my SMS-1 in the chain there had always been much exaggerated bass at times or there seemed no need for a rumbling of bass during some passages. There is more punch evenly spread out in the room without being exaggerated.

I need to refresh my memory with the manual for the SMS-1 to see if the way it is calibrated will make any difference with this change in the 990.

For anyone still unsure about the upgrade I would highly recommend it.