I bought my angel pack about 4 years ago. The price tag may sound a bit steep but for a product that continue to use and reuse I think it has more then paid for itself.
With my first child we purchased a popular brand and model and after about 3-6months we gave it away and only used it maybe 2-3 times. It was bulky, complicated and uncomfortable.
The angel pack was a blessing. My son was too big by the time we got it but my niece was my test dummy. Shortly after my daughter was born and I carried her in it every where we went. We once went to a convention and I carried her in it for 2 days straight without her complaining once, nor my back hurting.
I even put my blazer over the angel pack and from behind you could not tell I was carrying a baby.
2 years later and I can still carry my little girl in it all day without an ache and she falls right to sleep when she goes in it. So obviously its comfortable for her too. She enjoys being carried in it and I enjoy having my hands free why carrying her.
Its really one of the best investments a parent can make.