Oh I just had it done. Still think it's lowkey a scam, but I'm trying to convince myself it's the same as changing fluids on a used car - peace of mind that it's done.
The dryer vent cleaning ($50) is well worth doing as a lot was stuck inside of it, but it looks like you just need an air compressor and a really long hose. I'll probably DIY it next time, guy said that it should be done every two years or so.
I thought the duct cleaning was going to be a lot more intensive with a hose whipping the vents to loosen up build up, but it was stick a hose with 10lbs of pressurized air and call it a day. Anecdotally, the air intake to the furnace is a lot cooler to the touch compared to before, but my furnace continues to throw an overheat code LOL.
For reference:
I paid $100 cash on top of this for the dryer vent service + furnace cleaning (this part was a scam, he just blew compressed air in the furnace to loosen up the dust build up). And as per usual, multi point inspection is a gimmick.