I really, really love mine. It was what I transitioned to after I could no longer wear DS in a stretchy wrap
when he was about 9 months old.
He's now 2, nearly 15kgs (32lbs) and I can still wear him very comfortably in a back-carry, even though I'm 38 wks pregnant. I like the wide, comfy shoulder straps and the wide waist strap.
I do find the the pop-up 'headrest' is more for decoration than anything - it doesn't hold DS's head up if he falls asleep, but he's on the 97th %ile for height, so perhaps it might work for LO's who are not so tall.
ETA: Just realised that I'm wearing the same outfit in both photos. How embarrassing!
And, I also wanted to say that in the photo of the mei-tei, I'm wearing DS a lot lower than I wear him now ... I think practice has improved my baby-wearing technique.