The bed in the master bedroom is a queen. The beds in the garage are larger than a king. We're actually on the hunt for sheets that will fit those massive beds now.
You are correct in that the lower bunk converts to a dinette that will seat 6 folks easily and maybe more. When the dinette table is used, there is no room to exit the left seating area (facing the rear door) without popping the table up from it's legs and rotating it or exiting through the three season doors to the patio. This is something that we did not notice until after our purchase. We have only used this area once when it was raining, as we typically eat outside during our trips.
I noticed that the new RW 356 model is basically the same coach, but without the half bath in the rear. Personally, I like the half bath because you can easily access it from the outside and keep the dirt, etc. from entering the main living quarters. As a matter of fact, we've taken to using that entrance primarily and the having the garage as a "mud room" when it's raining or when we're camped where there's lots of dirt or sand.
In my opinion, folks that like the RW 355 will be drawn to the way the main living area is laid out. My wife loves the opposing sofas that enable 6+ family and friends sit comfortably and be facing each other for easier conversations. We've had 7 seated in the living area eating chili on a rainy night.
The other main feature that did it for me is that the garage bunks lift higher than in many other models for more clearance. I have a golf cart with a 6-inch lift that would not fit in most of the toy haulers that we looked at because of height. It fits perfectly in the RW 355 in both height and length.
The cabinets, appliances, bathroom fixtures and all other details are very nice in this unit and of a slightly higher quality than some other brands that we looked at. I'm a detail guy, so that stuff matters to me. I do have the coach at the dealership getting cabinet doors aligned, refrigerator doors leveled, rims replaced because of small scars, etc. I'm sure I'm driving them nuts with the minutia.