I am pretty sure that there is not an adapter for an infant car seat. I have seen the "Safari" ones out on display. I put DS in it and it was much smaller then our current single BOB. I personally wouldn't buy it.
I can't say anything about the double, but we've got the single InStep jogger at my parents' house as a spare. It's held up really well, but then again, it's definitely not getting daily use. Not many bells or whistles, but totally sufficient and DS has always seemed comfortable riding in it.
the bug & bee blog
(read it. you know you want to.)
anderson . september 2008
vivian . february 2010
mabel . august 2012
Re: In Step double jogging stroller
(read it. you know you want to.)
anderson . september 2008
vivian . february 2010
mabel . august 2012
Don't have one, but the reviews on BRU's site weren't very good. I think most of them talked about the front wheel not turning???