sliders are better than stock malossi rollers. Accelarates quicker and top speed is higher. The only problem with the slider is they "roll" out of position faster if n0t lubricated. Can't find those kind of lubricant spray over here, n0t even in duty free shops or american stores.
How about powder graphite? Most locksmiths carry it
Truth about rollers is they don't really roll One side is softer aluminum (var) and the other is steel (ramp plate). The roller is "dragged " across the rougher surface of the var, as the other side "slides" on the harder steel. That is what creates the "flat spots" on rollers.
Truth about rollers is you can compare them to performance "hi lift" cams. They start out taller than the roller= finishes it's travel taller than a roller. Their design shape was necessary to achieve that height, NOT because that shape moves better inside the var.
I have used Malossi rollers in EVERY scoot I have owned in the last twenty years because their "composition" lasts longer, and causes less variator wear than any others I have tried.I recently tried Dr Pulley 7gr sliders, and put the Mal. rollers back in after (2-3) days. The sliders had Too much control over the engine I felt. Matbe 8gr will work but till then rollers for me