specialized fsr shock upgrade

i have an 07 fsr comp.with an x-fusion shock.i would like to upgrade this shock for a better performing shock.i am told by specialized that it is a custom shock and a triad is an alternative.has anybody any experience of this upgrade and can any more suggestions be offered.
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What are you actually finding wrong with it? I know the latest review said it was only adequate rather than amazing but it seems to be doing a perfectly good job. Even just pedalling her bike around the car park I've noticed no major bobbing and it seems smooth enough...
Theres full-lock Pro-pedal and Fully open
was an ok shock but no adjustment on the Pro-pedal
not like the Fox rear shock
Just an ok shock
Go to a local bike shop and take a bike out to
try along the road and test the shock.
Good luck