I run coilpack on a aftermarket ecu, they do seem to give a better spark, and this would tie in, as they came into mass use around the time of lean burn stuff getting common, which need a better spark to ignite ever weaker mixtures.
MSD do a lot of development before they release stuff, and don't do so until 110% convinced any and all problems have been ironed out, but still help in the even of a problem, which I must say I haven't seen with the coilpack conversions, seen some dodgy ford electrics though!!
tabetha