There are endless posts on this topic. My summary would be this:
- Affordable glass protectors are basically all the same: they have adhesive on the edges, they don't stay on, fuzz/debris collects along the edges and look horrible, touch sensitivity is poor - especially at the edges, and the ratings on Amazon are typically horrible for a good reason.
- There is a very expensive option that some owners swear by - and that's really great for them. However, there are many owners that report bad experiences for a number of reasons and importantly, the company does not provide refunds or free replacements, causing some owners to pay north of $100 for repeat applications.
- Film can work for some, but all film products have the same drawbacks - they don't work as well with the stylus, have orange peel and don't protect as well.
So, pick your poison. Film has pretty good reviews, but it won't get any better - glass may. I think it's generally agreed here that there's yet to be a glass solution that works for even "most" buyers. We are all waiting for a generally-accepted product for the N8.