While I've done 4 split stays, I don't think I'd do it if it was one value to another. When I split, I usually do it because I cannot afford to stay at mod or deluxe the entire stay, so I might stay at a value for a few days, then switch to a deluxe for a night or two at the end. One trip we went from value to mod, to deluxe.
That being said, if you decide to do it to experience different resorts, it's usually not a problem to have luggage transferred for you. Just follow travelin' tigger's instructions.