I,ve got hundreds of these backfitted systems from a well known source (not PPM)
None would be worth the paper their printed on.

I,ve actually posted a few on here.

Rules like "Last run in 14 days /2nd last run in 35 days/3rd last run in 46 days"

I,d say there would be more than 1 person on this forum who fell for them too.

Cheers
darky