I had the 3rd set of mapbike's pucks. They worked flawlessly. The motor has a Puch Hi-Compression head and around 11.5:1 compression ratio. Stock pucks were trashed in no time. The difference was night-and-day. no more slipping when starting and the bike wanted to do wheelies.
Never had that with the stock pucks. They bed themselves fast and really little dust was generated and that was at the outset when they were breaking in. After the first inspection I did the dust was less apparent. I would make regular checks and clean and re-grease the gears often, the grease tends to trap the loose dust.
I'd have more to report but my Chinee stuff let me down for the last time and the parts are all gone. Just need to get to the post office and get the last of them shipped with the clutch pucks going to Portugal