What band changed the most for you over the course of their career?

I couldn't really fit a good explanation of what I'm looking for into the title of the post so I'll expound a little here. Obviously all bands evolve over the course of their career, but some more than others. Some even shift genres completely and their end sounds nothing like their beginning. What band(s) changed the most for you? What bands did you like/dislike in their early career, only to morph into something you felt the opposite about later on?

I'll start with an example probably no one here has ever heard of. Back in the late 90's/early 00's there was a local band in Tuscaloosa called the Dexateens. They played extremely raucous garage punk and were pretty amazing to see live, but never put out any recordings that I ever knew about. Fast forward a few years and I had left for the Navy. One day I was visiting back home browsing a local record store and lo and behold, there was an actual Dexateens CD sitting there! I bought it immediately and as soon as I got in the car I popped it in the player, ready to hear some of the abrasive nasty punk rock I remembered from seeing their shows. Instead what I got was... some barely-rocking alt-country? What the frick???? Truly one of the most disappointing days of my musical life. Now, for all I know the Dexateens may actually be the greatest alt-country band on the planet, but I'll never know nor care because I want them to be what they originally were.

What I wanted (Fast forward to about the 12:00 mark for the actual music, and also long live the Chukker, which is now dead)

What I got

For some more well-known examples, for a band that I loved early but did not care for later I would offer the Sword, who moved from kickass stoner metal band to some kind of less kickass alt-country-rock thing after about their third or fourth album, and for a band I hated early but grew to love I'd offer Mastodon, who grew from uninspiring grindcore band to absolute maestros of prog metal.