I used the Deuter Kid Comfort 1 with both my kids (just sold it, sorry). I found it well made, reasonably comfortable, and the kids liked it. We took it to Mexico, which was nice, because stollers are pretty useless down there. Did a lot of dayhikes, but nothing overnight. The sun/rain shade is nice/useful. The gear compartment is small -- it holds some snacks, water, and a few diapers, which is fine for a day hike or round the town. The internal harness (to keep them in place) is pretty fiddly -- we stopped using it pretty quickly.
I found that you can put them in there young as long as you include quite a bit of padding -- just pack them in there with blankets, etc.
As for overnights, I capitulated early and gave up on the entire concept, and settled for car camping or day hikes...
Anyway, I'd recommend it, I see the models have changed somewhat, so not sure if they've gotten better or worse...