Both OEM coil packs lasted over 100,000 miles and about 10 years on both my Mk1 Foci. For coil packs, that can be considered premature especially considering that it's almost a guaranty that it's going to fail sometime in that range. I replaced both with entry level packs from rockauto.com since the reality is at least for me, I don't expect that either car will make it to the next 100,000 miles so I don't expect to ever need to replace the packs again.
It's up to you on how long you expect to keep your car or how many miles you plan on putting on it, but I'd advise against installing super high quality parts if you only would be planning on using them for half there expected life spans. Don't forget, are cars are already over 10 years old and nearing the end of there life expectancy.
Lastly, at least from my experience, when the coil pack fails, one or more cylinders will start missing. Yes, this is a major issue and you can't run the car long at all when it starts skipping, but it won't cause any long term issues if fixed right away. In other words, it's much more economical if you wait for the coil to fail before replacing it rather than swapping out a potentially good pack every so many miles.