Features
One of the features we liked the most was the optional "stealth"; mode. With this you can choose if you want the software to run out in the open or if you want it to run "hidden" from view. We feel like this is a choice some folks will be glad to have.
Ease of use
The application itself was fairly easy to use, but the user interface itself is just plain bad. Frankly, it looks like it was written ten years ago and clearly doesn't hold itself to the modern user interface conventions. For us this made it just
feel cheap compared to the well-polished competition even when it was doing its job fairly well.
Monitoring effectiveness
It did well in the areas we expected it to, but surprisingly, it was quite weak at recording web-based emails. We had to rely on other mechanisms (like screenshots) to find things we knew we were looking for in web-based emails.
Accessibility of information
Like much of the competition here, it doesn't have a web-based option for viewing recorded data so you'll have to have access to the recorded computer to retrieve data; however, we were pleased to see the software had an optional Stealth mode.
Customer Support
Support is provided only via email, which for some people is a turn-off in itself. In our opinion phone support is a must, even if it's on a per-call basis. Support is offered 12 hours a day, 7 days a week, and they claim to have responses to most questions in 24-48 hours. The hours of operation of their support staff aren't disclosed on their site, so we can't offer any guidance on what to expect in that regard.
Guardian Monitor is a solid, if unpolished offering. While on occasion it missed recording some data, for the most part the product performed well. Regrettably, the user interface is just not on par with the other polished, professional applications its in competition with. 
