"Greg Halford stood out as one of the best players in the Championship last season for me," said the former Arsenal, Manchester City and Sunderland centre-forward, who as chairman authorised Roy Keane's first signing of the summer.
"He would be one of the three or four players I saw last season who I thought were definitely better than Championship standards. He played extremely well against us at the Stadium of Light last season, even though Colchester lost the game 3-1. We had three players marking him at one stage even though he was meant to be playing full-back away from home."
Although Sunderland had to pay £500,000 more for Halford than the Royals did in January, Quinn believes his unheralded arrival will prove a shrewd move.
"I was delighted to get Halford, which seems to have gone by a little unnoticed," Quinn told The Journal. "We felt we were getting close to signing him in January but the lure of the Premiership just took him away from us."