I used to have problems with it in my old PC DualCore @1.88GHz Intel Processor with 512mb RAM. But with my laptop Core2Duo @2.00GHz with 2Gb RAM I didn't have any problem. I runs smooth with Private Firewall, MABM Pro, Prevx Safeonline, Winpatrol and ikill in my Windows 7 ultimate 32bit Laptop.
Its detection is pretty good although there is lack of good reviews about it. I admire it due to its decent/not too agressive detection and good cleaning ability, frequent updates, thorough scan. It scan most thoroughly among all AVs I have tried (at the second place comes MSE), it scans even PDF streams like an archive. That's why its scan take a longer time to finish. In my HDD with 50Gb of files (PDF, Archives, ISO files, songs) it took 1:30 hr to complete.
Their
is quite friendly. Also their
is very good. I got fixes for false positives/potential malwares within 6 hrs.
Here are some of their good web resources