I use it, I had my computer built to spec last year and they guys who built it suggested it, and consider theycould have put on a paid for and walked.
Its been nothing but fine I have had no problems at all. I have recommended it to all my friends and they have no problems.
I have read on here that it may not be as up to date as it could be, but I have put on the latest veriosn and its fine.
Put it on if you don't like it take it off, be aware though that you would have to remove the old security software, especialy Norton as Norton doesn't "like" anything else and it will conflict and crash your machine.