It's a very nice vibrator. Not my girlfriend's favorite, but she enjoys it. If you like really direct clitoral stimulation, rather intense vibration, and lots of fun patterns, then you might have a lot of fun with it.
I think I'd like to get it eventually, since it's just so pretty. I'm also curious to know whether it makes your hand vibrate like the MiMi does... If it doesn't, I may invest a bit sooner. I'm perfectly happy with my MiMi, though, and I'd use points or coupon codes to get a Seed to make it worth it to me. I think the Zini Donut, however, is something I'd be willing to pay full price for, if need be...
Personally, the Seed hasn't done much for me. While I love the lights and colors, it's buzzy to a fault and almost seems to be coming apart at the seams! By this last bit I mean that the silicon and plastic portions gap where they meet in such a way that cleaning becomes difficult.
However, the vibe is remarkably quiet, is well fitted to the hand, and offers good pinpoint stimulation. And if a powerful buzz works for you, you're set.