The only one I use, the only lube I sell. I have used them all, there is nothing cleaner in desert dust conditions, or more effective. Lowest maintenance also.
4 oz ProGold Prolink $8.95 . ($18.99+tax bike shop price)
2 oz ProGold Prolink $4.95
4 oz ProGold EXTREME $9.95. ($24.99+tax bike shop price)
2 oz ProGold EXTREME $6.95.
The xtreme version lasts a bit longer, it is what I prefer.