Discovered this shotgun dryfire simulator for sale, from England. From past experience with pistol shooting I know that correct dryfire practice can be very helpful to performance.
Has anyone had any experience with this system or others?

http://www.dryfire.co.uk/

It looks good, have watched the demo video on the USA site.

http://www.dryfire.com/what.htm
Go to downloads tab.

It is pricey, but seems good. Just wanted to get some feedback from someone who has tried it.