Buying a new Razer Mouse

Hi there, recently having a lot of issues with my Razer Viper Ultimate that is getting old and has lived way too many hours on my heavy gaming sprees, I was looking at buying the exact same model given I’m pretty happy with it, but when I looked it up on the website, you can press on the buy button but there can’t do anything else like you would any products(I’ve tried for other products and it works fine). So my thoughts where that Imma have to buy another model and wanted to know if someone knew how similar the Razer Viper is in terms of size and overall if it’ll feel the same as a Razer Viper Ultimate.