Easy to install the software and, thereafter, plug in the USB adaptor. However, if you are not familiar with the steps to take after, the set up is not easy.
The instructions provided do not go beyond the software installation and it is implied that once you have installed the software, then everything will just work. No...
You need to go into the ZD software and apply your WPA key. If you don't have the savvy, experience or natural inclination to grope around with unknown software then might find that you are knackered.
In saying that, once you have grasped that you need to go into the ZD software and apply your passphrase (WPA password) then it works very well.
I suspect that you might be able to get it to work from Windows Zero Configuration, if you know what you are doing - but, as a newbie, I don't. So a few more, simple instructions, on the pamphlet would have been handy.
Finally, I have the Safecom adaptor working with Netgear 834 router and it is working very well.