This is, hands-down, the best portable audio system I have ever heard. It takes a few minutes to set-up and pack-up, and you need a power source to run it, but wow! does it have great sound! I have used it for parties, outdoor BBQs, and on vacation and it never fails to sound great. The included speakers and amplifier, the necessary cables, and your iPod, all pack into the included hard case (which also contains the subwoofer).
My only gripe is that the connections are all clip-connections rather than banana connections, but Radio Shack and other sources sell small banana-style plugs to use with clip connections, making set-up much easier (no frayed wire ends).
I can’t recommend this enough for anyone who wants audiophile-quality music they can take with them to a cabin, condo, RV, or to their backyard as needed. The price is higher than your standard portable units, but Cambridge Sound Works constantly has sales and coupons on the net, making the price a little bit better. In any event, it’s well worth even the full list price!
There are few things I have come across that are “best of class” but this is certainly one. The only other thing I can think of that I have found to be as perfect are metal tongs for cooking; I use those more than any other piece of kitchen equipment to the point that I don’t see how I ever cooked without them.