Anyone using DPM recoil reduction for their Shadow 1?

Is this a worthwhile upgrade for my new Shadow? Thoughts and experiences from fellow CGNers would be greatly appreciated.
A lot of folks shoot their Shadow I in IPSC Production division - and the DPM Recoil Reducers are illegal in IPSC production so you might have a small group of people who can answer your query.
 
I tried that in my old Shadowmate for Steel Challenge, hated them, a regular recoil spring is all you need. Total waste of money.
 
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