I'm thinking about getting some sunglasses with 3 or 4 sets of lenses. Seems like the best of both worlds: multiple sets of lenses for multiple conditions, but without the cost of multiple sets of sunglasses.

Now, for those of you who already own, do you think it's worth it? My only concern is that swapping lenses in and out might be a hassle and so I won't bother doing it. Or, the lenses get scratched up in the process of swapping.

I'm willing to spend up to $100 for a pair. Feel free to recommend.