Confusing marketing and description about it are unfortunate - DevKit provides Visual Studio style solution and text explorers, and maybe additional features since last time I verified this.

In order to write C#, however, you do not need that - base C# extension that has no licensing strings attached is the actual language server you need. And solution explorer, should you want that, can be restored with Ionide which doubles as a language server for F#.

And, hey, at least it's not like with Oracle where SDK distribution itself that has a trap :)