I absolutely LOVE my BOB Duallie. We bought it when my second was born and it's been well worth the money. My kids are now 4 and 2. My 4yo is tall for her age 42" and fits in it just fine. I use it daily in the summer for walks. I've also used it at the zoo, state fair, etc. We also took it on a 12 day trip to Disney World. I would have died without having it there. It turns on a dime and pushes like a dream.
It is expensive, but we bought it at REI when we got a 20% coupon. It put the BOB at a price that they were selling for used on Craigslist or eBay. It was the only way I could convince my husband to get it......knowing that if we took care of it, we could pretty much re-sell it for what we paid for it. I have to say, though, now that we have the stroller, even he thinks it's been totally worth the investment.
It is a bit big and cumbersome for getting in and out of the car. I have an Envoy XL and it just fits in the back when we are not using the 3 row seats. The only other thing I don't like about it, is that it doesn't latch shut when folded. When we traveled with it, we just ended up using a bungee cord to keep it folded on the plane.
Good luck!