Wow that's a lot of fabric!
mine was given to me and was a small that the original owner hemmed even shorter.
there's a really cool back carry you can do later on if you have a super long tail on your sling tho.
anyway, I'd say if your LO has a good seat and good posture and if you're comfy then it's good.
i think I usually have dd up a little higher and more to the center of my body. I also try, but usually fail, to get the rings to land a bit higher toward the shoulder.
i had to practice a lot with it, but it is very nice for quick up and down carries. Indispensable for getting through a parking lot while holding hands with my crazy 4yo. :)
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