I bought a keyboard/mouse set called Logitech Cordless Desktop Pro or something like that about 10+ years ago and I’ve been using that set ever since. Many of the labels on the keyboard keys are long gong, and the mouse was not looking good after all those years of hard daily abuse. 
I know the old mouse looks very disgusting.
I bought a new mouse this weekend at the local grocery shop Ica Maxi. It’s a fancy Logitech Optical Gaming Mouse G400. I did not go wireless this time as the trouble of changing and charing batteries isn’t really worth it when I only use it on my desktop anyway.
The G400 is actually very nice. It actually fits in my hand, just like the old mouse did. Most mice these days look like they are designed for small children and they are barely the length of my fingers.
Back of box story is that the mouse is “high performance” 3600dpi and “engineered for a long life”. I hope it is. I used my last Logitech mouse for more than 10 years. This mouse feels just as comfortable, so I hope this one also last a long time.
Thank you,
The information you have shared is very informative.