I've had both. On my 97 +4 Suplex got rid of the nodding dog syndrome at speedo was overall better but the car had before knackered king pins & shocks.
My 06 Roadster has a different camber angle and AVO shocks. It handles far better than the older car even with Suplex. I don't see me needing on this car to upgrade. But it is a personal choice.
I have had both roller & organ peddle. Frankly I see no difference unless you want to toe & heel.
In my experience the nodding dog syndrome is usually to one on the parcel shelf.
Sorry couldn't resist, with respect to Morgans I believe it is due to stiction of the king pins, either due to being worn out and need of replacement or due to poor greasing maintenance. On my +8 I replaced the pins and bushes going with Mulfab setup and all was fine. On the Roadster they had no bedded in and needed some serious greasing two or three times pumping all the old stuff out and going up and down a bumpy road. I replaced the grease with Lucas Red n Tacky which IMHO is much better than other products.
