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If they are anything like the SIRT AR bolt. Worth every penny, you are able to fire and have the sear reset and see if you are able to shoot without moving off sight. Makes dryfire practice way more practical.
One of the things that struck me about these is that it allows you to do some practice for stuff that you wouldn't normally do, as well as ramping the stress up while being able to see if you've maintained accuracy.
I use both my pistol and AR bolt SIRTs all the time. At home for dryfire practice and at the range for practice and of course for teaching. They are both invaluable as training tools.
I've actually got a bolt and a pistol left over from the group buy too.