Our family has used MVT three times and have had great success with them. I know they have saved us thousands of dollars on our trips. There were some limitations, but all in all I would recommend them to anyone.
I do have a question. We have tried requesting rooms using the Touring Plans tool a couple of times when we have booked through MVT. Neither time we were successful. Has anyone who has used MVT had any luck with room requests? I am guessing a lot depends on room requested and availability. I have wondered if convention rates are booked into different areas of the resort. We have been given rooms out of the way and viewing a parking lot when we book through MVT. Booking through Disney we have been more successful with our room requests. In August we are saving over $200 a night on a seven night trip using MVT, so I will take a longer walk and parking lot view to save that much money.