Why the Canon 24-105mm Lens Rocks

I've been using Canon camera products since 1996 and embrace the fact that they are always evolving their lenses to make them the best on the market for the price.  I've recently transitioned from 3 lenses, a 28-135mm, a 24mm, and a 50mm to just the one 24-105mm.  I thought I would get more bang for my buck with the smaller pancake lenses but I was not that impressed with the images as I'd like.  About 2 months ago, I agreed to shoot a wedding for a friend and he had a 24-105mm I borrowed and was blown away by the versatility and awesome shots at 24mm all the way to 100mm.  The lens is not too big but is durable and since it is a red lens, you know it is quality.  After returning the lens, I sold my other 3 lenses and purchased the canon 24-105mm and never looked back.  What is the best all around lens in your bag?