Initially, I bought this mouse so that I could work at night without disturbing the sleepers. She served for about 5 years, until she spilled tea on her, even after that she works, but more active pressing of the buttons is needed, which is negative for fast work, so I decided to replace it with exactly the same one. In the photo on the left is a previously purchased model, on the right is a new one. The form has remained the same. The shade of the gray case has changed a little, the wheel has also become gray, an ated version of the logo has been applied, the black edging strip has become glossy. The first mouse was bought in a plastic transparent case, then even in the store without opening the package I was able to press the keys and appreciate the sound; ated came in a simple plastic box. The price of about 1600 may seem rather big, but given the service life and sound comfort of operation, a good ratio