I had the dr2 with the 20mm large rollers on my red 155cc buggy with 8/9 rollers. My wife's blue buggy has dr2 with the 18mm normal size rollers with 10.5 and 12.5. I put the 20mm variator on my wifes buggy to see if it had a power advantage because I was always pulling away from every drag race we did. It does have a advantage on flat ground but the 18mm dr2 is better at hill climbing because it doesn't bog down when going up a hill. That is why it took a lot of changes to get it dialed in. If I was to buy a motorio dr2 it would be the 20mm version because it has a nice upshift and it hasn't flat spotted the rollers even after 3 years of use.
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