Well we have been using the carrier for a week and my verdict is: money very well spent!
It comes with an instructional dvd which i watched once while practicing with a teddy bear
then i tried it with Toby, and after a couple of go's it was easy and i now feel like a pro. It's very simple to use, especially if you're using the newborn upright facing-in hold.
The material is very soft and Toby seems to love it and will sleep in it for a good 2-3 hours at a time while i get on with stuff around the house, and so far i have found it to be really comfy.
OH doesn't reckon much to it, he hasn't tried it with Toby but he tried with the teddy bear and got a bit annoyed at the excess material and gave up
but he was in 'one of those moods' after a long day at work so it probably wasn't the best time for him to try it out, and maybe when he sees me using it all the time he'll want a go to.
We haven't used it outdoors yet, but i think it will be fine, so long as your LO's are wrapped up. There is plenty of material so if it's raining you can always pull more of it over his/her head.
Hope that helps ladies