Yes, it really is secure. I can adjust it fairly easily too, I put her in and went into the store and she felt like she was hanging down a little too much so I undid the knot and just bounced her up and re tied very easily.
I think it feels like her weight is less distributed over my body but not uncomfortable. I only use it for shorter trips like in the store. If I wear her longer, I use the regular front cross carry.
Deb, Mom to Madeleine 8/2005 and Maia 11/2009 Nick: and Chris