I have been riding since 1969, had lots of bikes from a Triumph Bonneville (original) to SV1000s. I am now very pleasantly surprised by the new Kawasaki Z750S I recently purchased after many months of looking around mainly for a more comfortable riding position. I do track days and like to ride fast, but I want to keep my licence (we are surrounded by speed cameras in the UK latest government money making scheme, they say it is for safety but you should see where they are sited - At optimum sites to catch you out, not accident black spots).
For a budget priced bike the quality is pretty good, the power delivery is very linear and the low end torque is brilliant for traffic work. The bikini type fairing is the biggest pleasant surprise "it really works".
Do not be put off by comments about the comfort of the seat. In town traffic you are naturally forward on the seat which is great for filtering through traffic. When you get onto the open faster roads you shift your weight back on the seat and the position between pegs & bars is great, this is when the fairing shows how good it is, better wind protection than some of the more extreme sports bikes. Back to the seat, I ride most weekends on runs of 3 hours one way so a minimum of 6 hours for the return and my rear end is ok.
I judge a bikes quality by how it looks after riding through an English winter, a single English winter can destroy the looks of a bike. I always coat my bikes with ACF50 as I have with my Z750S. We are half way through and the roads have been heavily salted and it has been very wet, my Z750S is still looking good. I can say much better than my various Suzuki and Yamahas, so I am very pleased up to now.
All I can say is go ride one and if you like the ride buy it.