I rode in 2016 (the 50 mile route). It was hard, but huge fun, well organised and very bikey. I was just there for the day.
I marshalled it in 2017 (free entry, camping, lunch and goodie bag). Great day, lots of lovely people (seemingly) genuinely into bikes. That Chris Boardman stopped at my point and had a chat.
I staffed the bar last year (no pay, same perks, plus the odd beer, but not while working). It was okay, but I'd rather be on the road (whether cycling or helping).