Overall, bug fixes for ever and I rarely want new features.

Forever is defined as 5 years, in my opinion, and bug fixes include adapting to new versions of the standards it supports. (For example: I don't want my device to turn into a brick because everyone shifts over to a new version of ePub.)

I'll gladly lobby for the new features that I want, since free upgrades are always welcome. I simply don't expect new features because it is a bit much to ask for.