This has been an interesting question for me recently. I have seen in the past two days several Mr. Cartoon 6900s ($130) and a Dolphin + whale 5500 ($150).
It seems these watches carry at very least a $50 premium over their unbranded "base" models.
Are they worth it? I kind of like the styling on the Mr. Cartoon, but I only paid $40 for my DW-6900MS. Is there another source (guessing ebay) for these models.