Personaly I Have heard of the name but haven't seen or used it, Out of everyone I Know (Freinds, Family and Lan parties) No one uses it, I asked one day and was told not to use it because of problems, But wasn't told what sort, After reading things like this I wouldn't touch it. Mustn't have a big share or maketing out there.
MSE 2.0 (The new updated Version of MSE) is very good, AVG 2011, Avast, Trend micro, Eset and Kapersky are all good,
Stay away from Norton, Avira, Macafee and all others like them, mainly they are bloated, make computers slow, causes problems. and have higher false positives