In a stunning blow to gadget retailer Sharper Image and Coral Gables, Fla., plaintiffs attorney Robert Parks, a Miami federal judge Thursday rejected a proposed agreement to settle a class action lawsuit over allegedly defective air purifiers made by the San Francisco-based company.

The deal would have placed $19 coupons in the hands of 2 million to 3 million customers who bought the Ionic Breeze purifier. Opponents of the agreement said consumers should have been paid in cash.