Are Transitions Lenses awesome?

I haven’t had a new pair of glasses in a few years and I was thinking about getting some photochromic lenses (Transitions being the name everyone knows about). Does anyone here have them? Do they work really well? Do they ever mis- or overreact? Are they ludicrously expensive?

My only gripe with wearing glasses at all is having to squint when I drive during the day. My contacts are comfortable, but I sometimes don’t go home for 24 hours at a time and they get a little unpleasant. This is sounding like a good option.