Was a bit worried after reading others reviews but bought it anyway.
Been using it for about 6 weeks and it's flawless. I don't have the wifi issues reported by other users and can stream music to the IW3 for hours (from either iPhone 5, iPad Mini or 2011 MacBook air) without any hiccup.
FYI, I'm using a Linksys EA3500 router.
I purchased this speaker because we just wanted something in the kitchen, stream some music, and not disrupt the rest of the house. So far, everything is working great.
The speaker is rather heavy, probably because of the built in battery. We probably won't use the battery much, as we just have it on the charging base (which fits inside a small cut-out under the base). The chrome band around the bottom gives it a nice look as well. The buttons on top seem to be a good quality, they don't feel cheap or fragile.
Setting up the speaker was a breeze. I just connected my iPad and it prompted me to download the small free set-up app. A minute later, I punched in my WiFi password and the speaker connected without a hitch. Streaming iTunes via Airplay was no problem. One bonus was being able to stream Pandora internet radio.
I mostly chose this speaker because the more highly rated alternative was twice the price. The sound seems good to me, I'm no audiophile, but can appreciate good music and good sound. This speaker delivers.