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.