We had a category 00V room, which is basically just a verandah stateroom but on the concierge level, on the Dream last month. Our room wasn't that much more than the normal veranda room we had booked before, so our level of "worth it" is probably easier to attain than going for the 1 bedroom!
You book things 120 days out (of course you have to be paid in full that far out). If you're interested in a cabana, you have a much better chance at getting one because of this. You'll be in contact with the shoreside concierge staff around then. Some get phone calls, but we didn't. Then again, we upgraded after the 120 mark had already passed, and I emailed them based on info I got from my TA.
There's a special checkin area at the port. We were escorted directly into the first-photograph area without waiting in a line, then escorted to the ship. We were then escorted (after we greeted our extended family that was already onboard) to the concierge lounge, where we relaxed and were met by one of the staff. We were given a folder with ALL the info about what to expect written out for us. 100 minutes free internet, ipad rental, when the pre-dinner gatherings were (at those times, alcohol is free), when to expect food offerings, etc etc etc. All laid out for us. VERY nice.
We didn't didn't have any special requests, but we definitely got the feeling we could have asked for anything on our minds and they would have at least tried to make it happen.
The stateroom was *beautiful*. Laid out almost the same as the stateroom our extended family was in on deck 6, but glossy gorgeous wood and perhaps a bit more storage. The bedding was a bit different in appearance; don't know about if it was actually different because I didn't take a nap in my cousins' room.
We have opted to stay at that level for a future cruise; no need for the 3 of us to be in a 1 bedroom, so 00V category is good for us. Can't quite imagine doing the Dream in a different level. I knew that would happen, and it did. So beware.