It's OK, not magical!
Finding the bus terminal on arrival was not easy at all as CDG really difficult to navigate. Had to ask lots of staff and a few of them had no idea what the magical shuttle was. Took about 30 minutes to find. Counter was closed at bus terminal but thankfully a bus driver for the company was there and pointed us to the right bus stop. Waited 10 minutes. An hour journey to Chessy bus station with air conditioning and WiFi on bus. Then waited at chessy station for hotel shuttle.
Return journey I don't advise as we were close to missing our flights. Bus from Chessy station says bus platform J its not its platform O across the road. But thankfully bus is bright and obvious to see and was on time. Went to 5 Disney hotels to pick up other passengers and then got stuck in traffic. Back at CDG we got lost again trying to find terminal, took ages. Recommend taking taxi to airport as you will get dropped at your terminal and get there on time. WiFi intermittent on bus. Other reviews are right, nothing magical about this. But we got there.