Have used it successfully on J1.5 and J2.5.
Most importantly the technical support in response to a problem I had was quick and comprehensive.
You can buy this extension with confidence.
Thanks for taking the time to make this review, it is appreciated and it was a real pleasure working with you on this.
It's highly flexible so I can lock a site down tight as a drum, or leave specific elements open for ease of access and ramp up their security in other areas instead. For more vulnerable sites with lots of plugins and users, the email notifications keep me advised of every threat in real time from the negligible to critical.
If you're in any doubt but run more than one website then just buy it, with a multiple license and the offers they make on Twitter it ends up being a few quid per year, per site, and it's a load off your mind :)