Must admit I was expecting to open this thread to see 'feels amazing worth every penny' - your gains are not particularly big so not surprised you can't feel anything.
The appeal of the uprev is the 'drivability' which I must admit I felt when I had mine done, but, it was no different to when I had the throttle controller on the car which cost me £65 and a 2 minute install. If I ever got a zed again I would not do the uprev simply because in my mind, its just not worth the money when there is a much cheaper option (for what I want in terms of low gear drive).