I'm a brand new Skritter user, and after using it for a few days I've decided that Skritter is definitely worth buying a tablet for. I've held off using Skritter until it comes because, although I see how much potential the website has with a tablet, I feel like I'm not making much progress just using a mouse. I always found that memorizing how to write characters depends a lot on muscle memory, and using a mouse obviously doesn't contribute as much to muscle memory as a tablet.
Anyone want to prove me wrong? I'm guessing there are lots of people out there who have found success using a mouse, but I'm interested in hearing peoples experiences/opinions.