I assure you, you will be sorry you switched.
We stayed there for one night before we checked in at the Dolphin in April and I'll never do it again and here are the reasons.
Got there 3pm after driving 18 1/2 hours form Long Island and the room was not ready. I said no problem we'll go to Downtown Disney and come back in an hour or so and they said our room would be ready when we got back. Well 2 hours later and no room yet. They gave us coupons for free TCBY Yogurt and told us to come back in an hour or so. Well you probably guessed it, an hour later and no room, this time they gave us free breakfast coupons. I finally got a room at about 7pm and guess what, the air-conditioning in our room was broken. They said they would send someone to fix it, and guess what, they couldn't fix it. Now they supposedly had no rooms left and I asked to speak with the manager. Its amazing; she was able to find me a room with just a few keystrokes. At this point I'm just happy to hit the sack.
I really cant complain they gave me free Yogurt, free breakfast, and didn't charge me for my rollaway bed.
The next morning we arrive at the Dolphin 9:30 am, I get a free upgrade, the room is ready, no charge for my rollaway bed, and the rest of out vacation was great.
I've stayed at many different Marriotts and this was the worst I've ever stayed at. Its not worth the saving.
We're going down in July and I am staying at a Marriott again for one night but not the one at Down Town Disney.
Gary