RE: KKAFP, Hotsling or Peanut Shell
No experience with the Hotsling or Peanut Shell, but my DH had his own KKAFP and used it w/ DS from probably 2 weeks of age on? He really liked it. DS was a winter baby so that helped.
DH's was very sporty looking IMO...royal blue w/ black trim. He never hesistated to carry DS in it at home or out and about :) Once he saw how well slings work, he was hooked. He also has no problem using a Maya ring sling, solarveil ring sling, or a Kozy mei tei out in public, but those came later after he "got" baby wearing ;)
Mama to DS-2004
DD-2006
and a new addition-ds born march 2010