I'm still thinking about getting another bike which is better than the 'Tona for backroads etc . Might go down the Bonnie route but keep coming back to the 675 Street. I know they are brilliant solo, but what's it like with a pillion on board? Neither of us is huge so space/weight is not too much of a factor. So far.....
My wife's 2007 Street was fine two up for rides for an hour or so, but not if you are planning a long trip. The wife's Street 3 was standard model without the R's adjustable suspension or 4 pot callipers. The 2 pot front brakes needed a good, firm squeeze when stopping from speed and the rear shock could have done with firming up, but with no adjustment this was not an option. If you are planning to use the 675 two up on a regular basis, I'd go for a R model for these reasons. Power wise two up is not a problem T
Had a Street 675R, now got a 765RS and at 6'3" and 16 stone never even thought about taking a pillion, would imagine unless you and your pillion are on the petite side of small then the Bonnie would be the best bet.
CARELESSCHUCCA on here has toured all the way to Northern Spain two up on his street. They're no the biggest of folk, and managed fine doing some serious daily mileage.