Didymos, Didymos, Didymos!
Ok, I might be a bit partial, because I live 30 km away from where they are made. But I love them. Bought my first - size 6, very long - when pregnant with Wolfgang. My second - size 2 - when he was about half a year old, so I could carry him on my hip. Grabbed the excuse of expecting another baby when pregnant with Jutta and bought another one in size 4 and a narrow one for kids to carry dolls, which you can also use for carrying an older baby on your hip (when baby doesn't need that much back support anymore).
*Very versatile, carry on your front, hip and back, and there are various possibilities to tie it in any position.
*Is perfectly adjusted to size of baby and mother every time you put it on, also to if they are wearing a lot or nothing,
*There is a great variety of colours available, so there is something for everybody. My longest is basically blue, the middle one different shades of red and the shortest is a dark yellow and off-white.
*The baby is tied very tighly and securely to your body, which distributes the weight well and makes keeping your balance easy
Advantages especially for ec-ing
*Positions like the cross carry, double cross carry and hip carry allow for getting baby out and back in quickly and without any untying and re-tying
*As it is basically just a piece of cloth it dries quickly
*If baby should wet it while on the go, you can always choose another way to tie it and baby will be away from the wet spot.
*In a fix you can use the loose ends to wipe some drops of pee from baby's bottom.
The only real disadvantage to me is the prize - it's not as expensive in Germany as it is in the States though. And I always bought ones that where a bit cheaper because they where supposed to have little flaws - which I never found with any of them.
Disadvantage for ec-moms: Watch out for the long ends - they tend to hang into the bowl when using a toilet with your baby