When I got my Pikkolo, they told me that you are supposed to wear it at your natural waist, not on your hips. I like him on my back higher, so he can see what's going on
That's approx where I wear him on my front too. I cross the straps when he is on my front. Very comfy for me... but the beauty of these carriers is that you can tailor them to fit YOU comfortably.
The Ergo is to be worn on your hips. I find the Pikkolo comfy where I wear it, but I'm thinking that I'll probably get the waist belt support thingy as DS gets heavier. It's supposed to distribute the weight more on your hips.
I think that it will look a bit different on everybody, depending on their torsos, etc. Mine is pretty long. Like car seats, lol.
A great website that got me interested in either the Pikkolo or the Beco is
www.theportablebaby.com There are lots of great info and pictures there.
Does this help??