If you're playing the game via the stable client, then osu!direct is easily the best feature. It's pretty cool to download maps directly from within the game! I play on the lazer client where this feature is accessible to all players, so I'd say Friend Leaderboards is a neat one as well -- I like to compete with my friends! :')
1 feature i adore is not making your profile page dry as hell. Do try decorate your page coz I did not fiddle with mine that much when I still had supporter
I like two main features, including the page customization options, along with the background feature when you first open osu!. They are worth the money to me, and it also goes back to the development of the game as well.
"No one hunts for a deadman!" proud ot denizen |#1 cfo lover on osu|my carrd
I always appreciated country leaderboards. You can easily get top 50 on most maps without any mods, and you can compete in top 8 with just HD or HDHR. This is only true for small countries, I can only imagine how challenging it has to be to be even remotely competetetive in the US for example.
For me, the best supporter feature is the custom profile banner. It makes my profile feel much more personal compared to the default ones available without supporter.