Time for new chain and sprockets?

[VNA]

I have been looking at the Ognibene silent sprockets and DID vx gold set from M&P at £ 122.Never seen any reports about them and would be interested in Andy's opinion.
What is the difference between vx and vzm chain's.

Price :lol  It's a lot dearer.  But then 17,000 miles with no stretch.  I set the chain tension when I put a new tyre on, and re-set it for the next tyre.  That's every 5-6k on Pilot Road 3's.  I use a Scottoiler which helps.
Anyway google is your geek - http://www.didchain.com/streetChains.html