Considering a V46 or E52 monokey topcase. Any feedback on the pros/cons of these models is appreciated, especially regarding comfort of backrest and if passenger has to set back as far on the seat to reach the backrest as with the BMW 49L topcase. Also on how easy or difficult it is to wire the optional brakelight system into the bike's wiring. I've read that both size cases will hold 2 fullface helmets, but with V46 they cannot exceed Large sizes. Where can the best pricing be found? Thanx for your comments.

2014 G650GS, 2008 R1200RT
1986 Yamaha XT350
1985 K100
1970.5 R75/5 (100k glorious miles with no brakes and 1 mirror)
"What do you need that for Dude?" Donnie, in The Big Lebowski