Not sure how long rollers last. I also have an 08 agility tho mine has 12500km in it. I just fitted a race variator with 5,5g rollers and my scoot is a whole lot better now. I would recommend a race variator to anyone, after doing a full derestrict I think its the best thing I ever did.
Not sure about sliders either cos I never tried them yet, maybe will try them next time I change mine.