Can't comment on the Out n' About I'm afraid, but bought a second hand baby jogger summit xc about three weeks ago. Its great to run with, the wheels are well out of the way so you don't end up kicking them as you go along and it deals with most lumps and bumps on our roads just fine. We did an 8 miler with no problems at all. (Baby is 11 months old - wish I'd bought a proper running buggy months ago).
you and me both runningrunning. Just remember that you must be much fitter than the majority of the population to achieve the results you mention at the start. I try to remind myself of that when I feel rubbish! xx