I use it for OS X, and it is a fine product, but in reality it has limited usefulness due to the consolidation on cloud computing and the control of the Internet by Google. It is not possible to limit connections to miscreant sites without blocking legitimate ones, if they share the same ip address(es) or blocks, as is common with cloud computing. It is not possible to block Google without breaking some or all functionality of perhaps 90% of web sites, since so many sites rely on Google APIs for the creating of their sites.
