It's a little long IMO. You can cut down on the lightning effect and the connecting of the petals. Maybe it's just me, but I don't like watching intros that are more than 5 seconds long, especially when they're just a logo. They should be short and sweet, and I lose interest when they're too long.
It's very nice in general though, I especially love the glow on the connections and the shimmer at the end, but the lightning effect could use some work, like less intensive blurring and better form. Something I've learned from effects is that it's not about your filters or the number of particles, it's the form of your effect. Filters and particles are just sprinkles at the end