I've bought two Imation CDRW packs in the past four months, from two different stores. And in both - the majority of the discs were defective. Half the disc recorded OK, but in the other half, the data was corrupt and unreadable, or - worse! - could only be read correctly on certain machines!
I know it was the disc that was at fault - not the PCs - because I've repeatedly had the experience of wiping the discs and using them again (in different PCs), only for the problem to recur.
So Imation have forfeited my trust - forever. I'd say "buy Verbatim discs instead!" - but a certain high street store has stopped stocking Verbatim CDRWs, guaranteeing that the product will soon be discontinued!