Pros:small, great sound, easy to use, travels well.
Cons:Need winxp to use all of the features.
I've had my C100S for about a year now. It travels great in the zippered pouch that comes with it, takes a beating in my laptop backpack and works great everytime.
Recommend this product?
By using Skype with this polycom I don't need a 2nd phone line, and with all of the 800 numbers that my conference calls use it doesn't cost me anything to sit on conference calls which has reduced my cell phone minutes usage (and bill) by hundreds of minutes per month.
This is probably one of the best electronic gadgets I've bought in the past few years. Though, it works best on Win XP, luckily, that's what I'm running and will be for a long time yet. I suppose they'll have Vista or Linux support for this sometime down the road.
I have recommended this product to several friends (and I found out about it from one of my customers) and they all love it as well.