I wish I could afford or justify spending that much on a BOB but I have a Baby Trend Navigator ( I think) and I like it. I also have the single one too.
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I have a baby jogger city elite (similar to the BJ Summit). I LOVE it and wish I had bought one sooner. I was able to pick it up for $300 used off of craigs list. It was in excellent condition! Even with my two oldest in it (they are 45lbs each) I can push it with one hand, and almost no effort on a flat surface... can't say that about going up a hill, but pushing 90+ pounds up a hill isn't easy in any stroller
My Bumbleride Indi Twin works great for the small jogs I do. But if you are going to do some more intensive ones I would highly recommend the Double Bob. I have the single one for when I take out one kiddo and that thing is amazing! I love both!
Re: how about double jogging strollers?