From my experience from such sharpeners the rollers should last for several years.
I had a japanese one which I used for several years sharpening my kitchen knives (bought for the Global ones), before I got the Lansky system.
The rollers still look as good as new.
sidenote:
The problems with these is that the sharpening angle is fixed, so irrespective of what knife you put in it (Victorinox, mora...), in the end they can only be sharpened at one angle.
If this is designed for Victorinox then the angle should work fine.