This has made such a difference to the wifi reception for our laptop. We are currently in a marina with an average signal at best. Our laptop could barely receive it and now has full bars on the signal indicator. Downside for us, though not specific to the product, is that if the wireless aerial in the laptop fires up as well, the two interfere with each other and nothing is received. It only happens occasionally, despite disabling the internal adaptor.
I bought this for use in France where I jump the wi-fi from neighbours. We sometimes got 1 bar but rarely, I had low expectations for the unit but it was worth a try with my other option being an expensive dongle. Crikey O'Reilly - It only blooming worked!!! 4-5 bar fast conection.. I'm impressed!!