Very good experience.
While it was not a perfect experience it was very good and we would definitely return. On the whole a spectacular hotel. The staff was friendly and very helpful and hard working. In particular the waiters at the Cafe on the Lake. Take a bow George, Javier and Gonzo; you know you are good! The breakfast buffet is one of the best that I have seen. I have a serious weakness for smoked salmon and apple crepes! I gained 3 lbs in 3 days there!!! My wife and I had a light supper one night. They had a home made soup Red Cabbage in beef stock that deserves permanent status on the menu. So simple yet so good. The pool is really nice and forced me to go out and buy a swim trunks. I went swimming three times after. The fitness room was adequate for me but was a bit crowded. The lobby is truly amazing with the giant lake inside teeming with Koi and turtles. 
Now the minor things that keep this hotel from true greatness. A place this grand deserves to have free and really good WiFi. They knocked off the $9.99 a day when I complained but too many lesser places offer free Wifi that works much better than the Westside Omni. The Wifi was slow and connection difficult. This needs improvement fast. This hotel has lots of techie conferences this is really important.
Our room was clean and nice except for one thing the bathroom. The bathroom was too small and the entry door to the bathroom made that space even smaller. There needs to be full length mirror and better lighting for that mirror. A serious safety issue was the lack of grab bars in the shower/tub that must be attended too. The safety catch on our room's door was broken when we checked in but the staff fixed it in just a few minutes when we mentioned the lack of security. 
All in all a really good hotel. The food and staff really good. We liked it and while it was a bit more expensive than we are used to; it is relatively a good deal.