Hi Pod,
I, too, bought and tried out almost all types of baby-wearing gear. As a chiropractor, I'd strongly dissuade you to use the Baby Bjorn. You must use a sling/carrier that allows hip and leg support by keeping the infant's hips and knees flexed and supported since their ligaments are very elastic and fragile (especially on a newborn). Also, it's important to have them in that position from the beginning until they start to walk for proper spinal development.
The Bjorn is one of the most popular, especially with men because it's has easy snaps and closures, but actually, it's not good for both the baby and parent. To be fair, though, it won't harm anyone unless you use it all the time, meaning, daily for over 2 hours continuously. I would say it's safe when you use the Bjorn up to 3 times per week and no more than 2 hours in the sling at a time. I just don't recommend it to moms because it's gives poor hip and spinal support to the baby, and isn't very supportive on the back for the parent.
So, for a newborn, I would recommend an Ergo (a Mai-Tai), a Maya Wrap, a Sling, a Robo, or anything that mimics that support. Older infants, once they start crawling can be very comfortable in an Ergo or Babyhawk, which are both the Asian Mai-Tai styles. It's easy, fast, and not too hot in the summer. That's the one I finally choosing more consistently.
Here's a great website for you to check out, all about carriers:
http://www.thebabywearer.com/index.php
Good luck!
-MaryAnne
