Check out Ebay, you can usually see better deals on USB mixers wiht more mic inputs and features for less money than that.
As Bobbsy mentions, the mic preamps can be noisy on the Behr mixers BUT the biggest issue with these mixers is the noisy USB output. The Behr mixers do not have a USB 'volume'/signal level control - and there is a high-pitched whine in the signal when volume gets to a certain level. This happens with other USB mixers as well (a function of the inexpensive A-D 16 bit converter) but some mixers have a USB volume control (my Packie ProFX does), so you can keep the output level down so the whine doens't happen. If you want to use this as aboth a live mixer and USB interface for recording the stereo ouput to a computer, look at another brand, like the Allen & Heath Zed series.