Hi all,
A quick update.
Only used it once since having it fitted, went on motorways to/from Ledgerwood for it's MOT. Have found no issues with it so far, the acceleration/slow cycle feels less in 4th than 5th gear and I think if I make sure the throttle pedal is steady before setting the speed it's more stable but that might be in my head.
Will post updates as I use it but the weather is not good at the moment.