I’ve got a couple of the Megadora’s.
They’re o.k. The tips are nice, they fit Japanese “Phillips” well, which is why I got them. I don’t, generally, like handles with soft components. The Megadora are not as bad as some, but they’re still harder to clean up than they could be. I wouldn’t pay a premium for them either, and that price doesn’t look that great?
The ball grip drivers seem to suit certain applications. I don’t have the Vessel, though I do have the similar shaped PB Swiss and it’s a good design as you can spin the drivers easily. Again, PB are hard handles, I don’t know what the Vessel are like.
My favourite Vessel are the “power grip” series shown below. These are really nice. Intelligently designed, well made, and very durable.