I don't have a problem or complaint about Razer's software... it is what it is and it doesn't cause any problems for me.
As for the Viper V2 Pro, I have now had the white version for a couple of weeks, and I am very pleased with it. The first thing I noticed, when compared with my other Vipers, is the superb feel of the main buttons. They are super crisp and have not the slightest bit of mushiness. The coating is very good, and I have not had any problem with losing my grip. The scroll wheel is excellent, very tactile and not too noisy. The stock skates are very smooth and give good control.
I haven't tried the new HyperPolling dongle (it has yet to arrive), but the accuracy and response of the sensor is about as perfect as I have encountered.
I use this mouse for everything - from playing to office work, and it is all-day non-fatiguing. It is a very comfortable mouse.
One thing that I simply cannot understand is the furor over the price - yes, it is expensive, but it is as premium in every respect as can be obtained in a mouse. It is a technical tour de force and light in weight. Why would anyone complain about the Viper V2 Pro's price, yet not complain about Logitech's Superlight? I makes no sense to me.
It really is not comparable with other Razer Viper mice - this is the competition version, like a Subaru WRX compared to a WRX STi. They may look similar, but the quality of components on the STi is not comparable to the standard WRX - they are far superior on the STi. If you can't appreciate the difference, buy the WRX and don't complain about the STi being more expensive. The same is true for the Viper V2 Pro.