Does anyone have one? If so, do you like it? Kamden really likes being carried, but he's pretty heavy already (20 lbs.) and he wiggles A TON!!! I can't really keep a good grip on him and I thought I might get one for him. We have the baby Bjorn, but I don't like it at all. It really hurts my shoulders and my back. I'm not sure I want to spend about $40 on something I'm not sure I'll like though. I've been looking on Craigslist and some resale places around here, but I've had no luck so far. Just wondering.