This is what I call the Cadillac of twins strollers:

I bought this stroller once my twins turned 3 as it was getting difficult to put them in their Graco tandem. This InStep stoller has been great so far and very easy to push. Keep in mind this is meant to be used outdoors. Keep in mind that this stroller is very heavy to lift, limited storage space and very bulky.

Stylish and functional, this highly mobile jogging stroller for two is a great accessory for any growing family on the go. The swivel front wheel design featured with the Safari stroller allows for easy mobility and maneuvering in busy stores and can be quickly and easily locked into place to convert the Safari into an excellent jogging stroller. Features: -12" swivel front wheels allows for easy maneuvering in tight spaces while large 16" rear wheels smoothly handle any terrain -Plush, comfortable cabin has removable seat pad and convenient grab bar for children -Convenient parent console and spacious under seat storage basket provides lots of room for baby gear and personal items -Durable steel frame is easy to fold and transport -Recommended age of 6 months old -Ideal for 6 months and up -Weight limit up to 100 lbs. -1 year limited manufacturers warranty

Combi counterpart tandem stroller from onestepahead - click on the image for additional information: