Well, I am a small woman and the idea of pushing a double tandem stroller doesn't seem like fun.  However, the Joovy Caboose is so well made that I can easily still push my kids riding in the stroller together even though one is 33 lbs and the other is 26 lbs.

I have even found that when I had 2 children standing on the back that I was still able to push and steer the stroller.  I could not say the same of other sit n stands. I bought one of the other brands and promptly returned it!  I took my children out for a walk with the other stroller and my husband had to push it most of the way.