I think this is a good price for a Wireless 3G Modem as this is an unlocked version is actually cheaper than Three sell them for direct locked!
I bought one from the Amazon seller and can confirm they arrive unlocked. I'll be using mine abroad next week with a local spanish SIM so a group of us can get online for a lot less than the normal roaming fees.
Mine didn't come with a SIM card as they would from Three, but I am using a Vodafone SIM in it no problems at the moment. I personally think these are much better than dongles because you can put them in the window for best coverage, and no drivers are needed on laptops - just use the WiFi signal they send the 3G on.