Right I've seen a few usb ASIC miners that mine at around 2gh/s , I'm not keen on my brand new 280x grunting for 21 hours a day and warming the house up as I do so at 300w . Are these usb miners worth a dabble? Like I have a 4 port usb switch .... Not saying id buy four but if I did that's a fair old pick axe I'm using. Anybody have experience with usb miners??