Personally I've never cared for the Fluidamper. The conventional type has and continues to work well for many companies. I've been using the SFI neutral balanced balancer/damper from Pioneer #872037 on my internally balanced 360's for years. No problems and is a quality, reasonably priced race unit.
http://www.summitracing.com/parts/pio-872037
Disregard the pic Summit has. It's generic and the Pioneer looks nothing like it.