MSE is not bad, but they made few pretty lame choices there. First one is horribly slow on-access scanner which out of all of them the only scans inside archives on-access. It gives no better security, it just makes everything horribly slow even on Core i7 920 system overclocked to 3,8GHz with 6GB of RAM and fast HDD. And second one is only 24 hour update check cycle. Which is frankly by far not enough for todays malware trends. I'm kinda shocked that not so many ppl are aware of this fact...