Judith we had an Out n About double buggy, admittedly didn't run with it although it was no problem in terms of manoeuvring around town. Great wheels and good suspension too, highly recommend their stuff.
I got into running once the kids were walking, however I see loads of mums and dads running with these buggies.
I'd suggest, if you haven't, go to your local park run and look at what people use there and ask about as you'll be with running parents. I go to Black Park, there must be a dozen buggy runners every week.
One tip I can give advice on, go to your local bike shop and buy the tyre mousse and put it in your buggy tyres if you're going off road.
Also, some of the buggies have long lead times so be prepared to order early or buy second hand. We sold ours online through local parents website, must have had 15 couples wanting it.