Today I sent back my Infantino sling, as it was recalled due to the suffocation deaths of a few infants in the past few years.
My favorite carriers are my Kelty Kids front carrier and my Sleepy Wrap. They are both very comfortable and have different strengths and weaknesses.
The Kelty Kids carrier I can put on very easily and in less than 30 seconds. I feel that my baby is very secure, it has a cell phone pocket, a detachable pouch where I can put snacks or a bottle, and a pocket and hook for my keys. I use it for walks and for grocery shopping.
My Sleepy Wrap is even more comfortable, as it is just fabric, but it can get very hot, so I do not use it during the hottest days of the summer. I love that you can put the baby in many different positions, depending upon their age, head control, and their preferences. It is nice to use around the house as I can put it on in the morning and wear it all day without having to re-tie it. I can use it for both my 21 lb 11 month old and my 33 lb 3 year old.
I have an Infantino Snug Rider and I HATE it. I can't get it to fit nicely and I'm never assured that my baby's not going to fall out if I lean over.