they suck,at least the ones from teva does have not had a chance to try endo's version but i do know that teva uses a polymer called hydroxyproply methylcellulose to try to cut down on the abuse potential it's similar to methacrylate copolymer used in most time released
morphine tabs but it gels a lot firmer than say-mscontin also the generic 80's due to this do not release the full dose in a 12 hour period i have had both and the purdue 80's are a lot stronger than teva even when taken as perscribed.