Specialized makes a really good stable of bikes. When I was in the market for a sub $600.00 mountain bike I had my heart set on a Specialized Stump Jumper. Though I got a Giant Rainier instead, the deal was too darned good to pass on. I have no regrets, but in the future, if I ever purchase another ATB it'll probably be a Specialized.
What model did you "testdrive"? I find it interesting that you said "drive" instead of "ride"... anyhow. Let us know what you'll be using the bike for and what model you were looking at, this will aid in those here giving you more sound advice.