My wife loves the back seat, as long as the top box is fitted to give her a backrest. The handles seem well positioned for her and the pegs are in the right spot.
A tip for helping your passenger onto the Crossrunner - once you're on and holding the bike steady, have her use the riders left footpeg to stand up on, then once she's swung her right leg over and sitting down she can scootch her feet back to the pillion footpegs and you're ready to go.
The riders pegs are lower down and closer to the bikes centreline, so she is much less likely to pull the bike down as she climbs aboard, and it's much easier for her if you have panniers fitted. Just make sure she's moved her feet back before you ride off!