A library written in managed code is simpler to access from other managed code than an unmanaged library.
A garbage-collected class written in managed C++ is simple to use from other managed languages, such as C#.
A class library in managed C++ is vulnerable to the loader-lock bug, but you can prevent the bug by eliminating DllMain and initializing libraries manually.
A managed class library can include classes that have been implemented in native code to improve the performance of the library.