Experiences from my various VC10 AAR flights, make sure you take a jacket with you, as if you are allowed down the back end its cold!!!!
Is great experience, i lucky enough to have seen many aircraft being refuelled such as Tornados (incl at night, great when the Tonkas engage burners!, Buccaneers, Harriers & Sea Harriers, Jags, refuelling other VC10's and E3 Sentrys & even 74Sq F4J Phantoms ( crikey must have been 1991 just before there retirement - remember that particular trip as forgot batteries for my dam camera so no photos of them!!!!! Doh!).
If your aircraft is gonna be refuelled by another VC10, then it does get abit bumpy due to the buffeting!