Not me but I've only used it a couple of times. Was great for me waited half an hour last time for bus to arrive and then half an hour for it to leave but it's public transport. I expected that. Both return journeys have been very timely.
It was a survey about MDE - the website, not the DME buses. I'll correct the title, sorry.
It is before my trip, I made my FP+ selections a few days ago for an onsite stay. From the questions asked I don't think it is just aimed at onsite guests.