Why is everyone so crazy about the Tula carrier? And is it worth the price?

I have tried Ergo, Lenny Lamb, Kokadi, Manduca and Tula since baby was a newborn until now she's 10mo - Tula has the best comfort since she is 10+kg. After a while when baby gets heavier, I get strains on my neck, shoulders and back. But never for my Tula, honestly. Besides it being pretty, to me, comfort level is important. I have since dumped the rest (they're all in a cupboard untouched) and only carries my baby with Tula.