I've been running it in VM for a few days. Haven't put it through any tests yet but so far it seems fine.
A good review by Alex Eckelberry from Sunbelt Software.
Thoughts on MSEI read one blog where people were acting surprised that MS was releasing a free security product to protect "itself" from the big bad internet. I guess they forgot about Windows Defender and the Windows Firewall, both free and have been there for years.
MSE isn't protecting Windows from itself. It's protecting users from
themselves. Just like any other antivirus.