I swapped my Sonic 97 over for a Tabou Speedster 100 the other day.
It feels way,way different from a Manta or a Sonic. A bit like the 105 Fox.
I use a Techtronic Falcon 34cm fin with a 6.6 and 7m. This fin adds adds to the super soft ride. I tried a 35 cm carbon Sonntag SLR but it feels on the big side for the board.
You do lose a fraction of speed with the Speedster especially going in to the wind,a little across the wind,downwind it smokes,especially powered up!
It gybes so nice I feel I'm a pro now

I swapped over to my 115 Manta late yesterday and it now feels like sailing a box in comparison.
I dislike the Tabou Rocket - it's too slow and unexciting.
The Speedster is similar to the Fox. Fast and ultra smooth.