I think Muscle Mustangs and Fast Fords did an article on them, they used them and a pair of autolites on a tune up and they said they gained something like 12 hp from just a tune up.
Myself and ttop88 have used the Performance Distributors Livewires with very good results. They are around $120-$130 a set. Their entire ignition setup works like a champ too. Thats what im running now on the coupe.