Two sets, low price, quick shipping, longlasting, works great!
Still recommended, but original are better
Original glides were worn out in few years.
Logitech provided no support, so we have to find gliders somewhere else.
We tried two different models, and this one works really great (despite wierd white colour).
We play Quake Live, so mouse have to work perfectly.
We are using Razer Scarab pad.
Update: By comparing original and these ones we came to conclusion, that original Logitech glides are better. We switched to soft Razer Goliathus pad, so original glides would last longer