I've been very happy with the steelcraft - DS is almost 9kg - so we are about to head to a rear facing child seat. Even if it was rated to 12kgs - he is almost to long and too wide for a capsule anyway (he's a chubba).

As an extra point - I put my capsule onto the new strider plus (a friend has one) and it fits!
Means when I go to a double pram I don't have to buy a new capsule and still have the benefit of a travel system!