N.R.
I don't know anything about the One Step Ahead strollers either, but another suggestion (though still pricy..sorry!) is the Phil and Ted Sport. Instead of a side by side double it is above and below. Sort of hard to explain, but check out www.philandted.com for photos. My kids are 13 mo and almost 4 and we LOVE it!! The best part is that it easily (less than 2 min with NO tools) converts back to a single for when my older child doesn't want to ride. No lugging a giant Bob with just one kid. It has easy stearing, large air filled tires and works great on trails as well as my brick road. You can find them on Craigslist or through Ebay as well. Good luck!!