IMO, yes, they are worth it especially on the heavier TT's. Both the MOR/ryde CRE/SRE and Dexter HD EZ-Flex suspension products for TT and FW suspensions will provide a smoother ride for the TT & FW and reduce road vibrations being transferred into the unit as well.
I don't know about the MOR/ryde CRE/SRE products, but the Dexter product comes with new wet bolts/bushings so you can grease the shackle bushings.
To insure effective performance with either product, insure that the model you purchase matches the bolt hole pattern of the existing equalizer. In some cases if the same bolt hole pattern isn't maintained the clearance dimension from top of tire to the wheel well may be reduced. Ideally, a 3" clearance under loaded conditions is recommended.
Hope this helps
MOR/ryde CRE/SRE (standard on some Jayco TT & FW models): http://www.morryde.com/aftermarket/suspension.html
Dexter HD EZ-Flex: http://www.dexteraxle.com/e_z_flex_suspension