Well just starrted riding 2 up now that I passed my license road test. One thing I notice right away is the bike feels alot smaller. The power is still ok and so far I've had it up to 80 with a passenger with still more to go. Now the mirrors are hard to use if not even almost useless. I have buckhorn style handlebars which I think I will definately need to be replaced very soon. I also noticed the brakes are quite as effective to the point where downshifting is really the way to go. I still have to air up the rear tires for 2 up and adjust the rear springs so I'm not going to comment on those areas until I do. Overall though my impression is this bike is better for one person than 2.

Just make sure the passenger knows to sit straight up. My daughter leaned left to check traffic for me & put me in the oncoming lane.

Aired up the tire and adjusted the rear shock to pos #5. Gotta say even riding single I like this setup better. Riding 2 up with these settings is drastic improvement. First no bottoming out every time you hit a bump. Second the rear end is much more solid through the turns and if you happen to catch a small groove in the road.

I agree with Silly Orge, the Ed L. Forwards help in the 2-Up riding.  

When I first got my Savage, my son was 13.  He fit real easily behind my 5'10" frame.  Well, he then went to High school and played Freshman football as a linemen.  Needless to say, he and I no longer fit on it.  It's the reason why I'm a FSO.