We just spent two nights at this hotel over New Years. While I would say our experience was nothing spectacular, it was quite acceptable for the class of hotel and the rate paid.
We paid $145 a night rack rate off-season for a room category called a "hospitality suite," one level above the standard room, which was going for $115 - 125. As diamonds, we were upgraded to a "resort suite" which was a smallish, not particularly luxurious, two room suite overlooking the pool.
There were a variety of choices for the diamond amenity and we selected a cheese plate and a half bottle of wine. Diamond breakfast is a coupon good for the continental (or credit on something pricier) in the hotel restaurant, which I would categorize as an upscale Denny's.
I looked at standard rooms and they are decent, smallish but also acceptable. This is probably the best hotel in Santa Rosa, but the main competition (a Courtyard by Marriott across the street) isn't that substantial.
If you're expecting the Park Hyatt Tokyo, this is not the hotel for you. But considering the room price and level of this hotel in the Hyatt hierarchy, I thought it was fine.