I liked it, when I installed its beta version (although beta, it was without bugs).
It was very light and it was not downgraded my system performance (I have a Celeron 800).
The updates was small and I hadn't to stay on-line for long time (I have a dial-up connection), just for downloading updates.
The user interface was somewhat unusual, but after spending 15 minutes exploring it, I got familiar with it.
Also it has the option for auto-update (better), or just notifying me, for manual updating.
Also it has the option for disabling the shield for a while (e.g. for installing a very heavy program).
Another advantage was that it was not demanding (after installation) further actions from me.
The beta testing mail support was excellent!
Well, my overall impression was very good.
I think, if you are searching for paid protection, you must try it, so you can create your own opinion.
License: Free Trial ($29.00) Details...