Albion spent £4m on the 29-year-old in the summer, and Reid insists that it was money well spent by the club.
"He's one of the top English keepers and he kept us in it," Reid told talkSPORT. "He's brilliant. He's one that we spent big on, and we don't do that too often.
"But with performances like that you can see why we spent the money.
"Obviously the highlight of the saves was the penalty, which was top draw."
West Brom now sit eighth in the Premier League.