if it still sound good to you..then it is a keeper. Not too much has been change as far as speaker technology goes (unless you are talking the very very high end stuff).
I have a pair 0f Mission 771 bookshelf speakers currently hooked up to a stereo. I am upgrading to a home theater system and thinking of just getting Mission 77-series center and rear speakers (I have a AR S108PS sub as well).
These speakers are 1998 models. Is there any reason to get newer speakers or will these work well with new components?