Pros: Excellent sound quality (very clear - best in class), comfort (the smaller of the included ear pieces fits very nicely in my ear, and I like that most of the weight hangs over the back of your ear because it stays planted - even during quick movements), durability (I've had mine for years, just bought one for the wife and she loves it), works on either ear, folds flat and fits easily in pockets, excellent battery life, and good styling (subjective, to be sure, but I like the black & gray colors). It has worked with every phone I've tried it on - mostly Windows Mobile based phones and iPhone/iPhone 3G.Cons: It's not the cheapest, but it IS worth the price.Other: My very first one went through the wash. It didn't survive. I don't recommend submersion, but other than that seems impossible to break.