It was worth it on my '03 with a dual disc clutch. Even with a single disc it made a difference. The NV5600 is a noisy bugger at certain rpms, and the Fluidampr toned it down quite a bit.
It also cured a driveline vibration in my truck.
My new '07 auto has a similar driveline vibe. My first step is to get a Fluidampr to cure it. I've long ago given up on trying to get a dealer to help me.