Yep, they have about the same failure rate at the stock ones not worth the price if you ask me.
Go to corral.net. There's a guy there (screen name '95SC') that's selling new sets of Motorcraft coils for $125 shipped. I just got a set from him. They work great. He's on a couple other mustang forums also.
I have Screamin Demon coils from Bill at SCP. I am happy with them so far but i've hear some grumbling about SCP on here. But my experiance with him to date has been good.
I had Screamin Demon coils on my 95 LSC, served me well for years. Just fyi you must run aftermarket wires with them they will burn up stock wires. I had good results with the MSD wires and the Taylors.