Instruct: Classify Amazon reviews into positive or negative sentiment
Query: If this costs $9.99, then buy it

I tested this over 10 hours with various distances and configurations with the Linksys signal monitor on. You can watch the signal/noise numbers jump up and down. With this product, in some cases, you will get some gain and in some cases, you'll get zero gain. It depends on where the wireless access point is located and what it in the way. For what you are paying $50+, just go ahead and get an WRT54GX SRX router through TigerDirect.com, get a linksys repeater (range expander), or an access point in repeater mode.