I had a graco duo glider. It did ok for the purposes I used it for. I wouldn't recommend it for anything more than shopping and stuff...no outdoors type things. I love my jogging stroller for that.
Let me clarify...the duoglider was great but the more its used the harder it gets to steer
I have an uppababy vista. I LOVE IT it goes from single stroller to double in a snap and also has a bassinet attachment that comes with it. It's pricey about $500 plus another $100 for the double seat attachment, but it's lighter than the duoglide (that is what I had first, I sold it on craigslist- look there for a cheap used one :)) and it's super easy to manuver, it turns on a dime even with the double seat attached. The best part is that it changes from a car-seat holder, to a bassinet, to a single stroller, to a double stroller in literally a minute or two and I only have to carry 1 stroller in my van instead of 3!! I probably sound like an add for uppa baby but I totally love this stroller. As far as a cheaper one, I liked the graco duoglider I had the new style one, but it was very heavy and I had to constantly switch strollers in and out of my van. It steered fine and had tons of storage and nice cup holders for the kids, it would hold 4 cups at once.