SoundCloud is my go-to for music while programming. I've spent countless hours curating my likes, playlists, follows, etc. I'd be quite upset if the service shuts down, 1) for the artists that have gained large followings through the service and 2) for all the personal time spent that will in the end mean nothing.
I think I'm reiterating what has been said before, but the reposting is horrendous. It's made the listening experience quite poor from just using the activity stream. I've also been really unimpressed with the lack of track uniqueness - if 2 artists repost the same song, it'll show up in my stream twice. Even more frustrating was the lack of uniqueness between tracks & playlists, where one could conceivably listen to the same song multiple times in a row because artists would post the track and then a single-track playlist with that track inside it.
The UI is also lacking for quickly adding to playlists, etc. The simplicity was a feature, not a bug, and the power of SoundCloud has been their artist community.