Theres a thread like this on the ZX6 forums as well and is still going strong, so this should be a popular thread.
Yesterday I picked up and installed my new handlebar risers from Murphs kits

Cons:
Stock mirrors become even more useless
Feels like the front end is more unstable during cornering, likes to wiggle.
Pros:
More relaxed position
More comfortable when standing on the pegs
Feels more agile
Recommend? Definitely, just need to adjust the suspension, and should work well with the footpeg lowering kit which I am expecting this week

Also picked up a new OEM (Z1000) 16T sprocket from the dealers, and my Supersprox back sprocket and RK chain arrived

Will install during my service which is due this weekend.