We have an InStep and it works fine - it's VERY wide if you're trying to get it through a doorway. It's fine if you're just putting them in it, leaving the garage and taking them out when you get home, though! The InStep is by far more than we need - the seats recline, the front wheel swivels and locks, etc. All the bells and whistles you'd need on a jogger.
Re: Double jogging
We just got the InStep Safari and like it so far! not super expensive but nice..and i love that you can move the sunshades all the way down