Pro: it’s free , (PC & Mac only). Con: The download is big ~60Mb ,
Although the Windows VST2 dll, (which is the version for Audacity on Windows), is only 2.4Mb
BTW you do have to give iZotope an email address before you can download.
All the Windows variants (8?) are packaged together in the one download.
Apparently no strings attached, just a link-button on the plugin to the iZotope website …
[I gave them a disposable email-address , so I won’t be getting any marketing from them].