I've never bothered with these as there are none in my immediate area, and few in the areas where I most often do my routes.
But I'm looking at some exceedingly lucrative jobs that I could make part of week+ trip once the windows roll over, and there are BP's along the route, with gas-reimbursement gigs few and far between, so I'm keeping an eye on them.
Gotta say the amount of detail covered in the guidelines is impressive... has me wondering the average length of time to knock one out? I'd be on a tight schedule and would be working a checklist on the fly and then completing the reports when I'm taking my breaks.
And as I recall seeing in other posts: the guideline photos are consistently horrible, with some bordering on useless.
Have synthesizers, will travel...