I have been using Trend Micro antivirus for several years now and have always liked it. This version is my favorite - it is everything you need and nothing you don't need. No stand alone firewall is included, but it does have enhancements to the windows firewall - however, for home use, I always turn software firewalls off since they tend to block network printers and my router provides more than enough hardware firewall protection for my home network. There's very little to configure with this, which makes it great for many users who don't understand complicated security software. As far as the person who said it blocked internet access while updating, I haven't experienced that issue. I haven't experienced any issues with it at all - it just runs quietly in the background doing it's thing very unobtrusively. My most important criteria is that it not slow my pc down, and this does that very well - seems to be lighter on resources than many other offerings out there.
I've been using Trend Micro products for a good 5-6 years. When I began using it the price was lower than McAfee and Norton, that no longer seems to be a selling point as they are all priced about the same. I have never experienced the performance problems common with the two aforementioned competitors. My pc's do not get progressively slower. Installation of this new version took about 30 minutes on both my dual core desktop and laptop. One reboot was required after the old version is uninstalled. I was surprised that after the installation it did not want to do a full scan. It could be because I replaced another Trend Micro product, but I'm not sure. I've never gotten a virus while using Trend Micro. It rarely blocks sites that it shouldn't, so I think they keep their harmful sites list updated. The software updates seem to be happening faster than with the previous version. I do notice a longer delay when starting Firefox for the first time, but no lags after that. I do wish they would cut down on the number of versions, maybe down to two, one with parental controls, one without.
As far as I am concerned this is the only antivirus/ spyware/ malware that I will ever use again