Diva- i honestly think if you hold onto your ergo for a few more months and then give it a try your critique will completely change.
like previous posters have said, it is not great for babies under 6 months. but once your baby is over 6 months, i am sure you will find it much more appropriate.
my ds is 9 months old and weighs 10kg. i use the ergo eveyday and have never had a problem putting it on- particularly in the front position. i find it distributes his weight very evenly across my back and it is very comfortable. i also find it very easy to just chuck on at the local shops etc. my dp who is 6ft1 also uses it, sometimes to do the vacuuming etc. and loves it.
i just wouldn't want someone to come along and read this thread and think that ergos are a waste of money because personally i have found it to be extremely handy and wouldn't part with mine.
jmo of course