My mom got me a new Sadie holder for my birthday (which isn't until July, anyway). It's much, much bigger than our Ergo, and should last until she's just way too heavy to wear. It's still a bit too big for Sadie right now, but I still love it.
Yep, the buckles are pretty easy to get to from the front or the back. The buckles adjust on both ends, so you can tighten easily in a front carry or back carry.