I used it a bit when it was still built into Visual Studio. You could even let VS generate some boilerplate class definitions, but it was never accurate and com

I used it a bit when it was still built into Visual Studio. You could even let VS generate some boilerplate class definitions, but it was never accurate and complete enough to use. Frankly, for a lot of systems some block diagrams and some notes on the relations between them suffice instead of a full class diagram. I do like to use the sequence diagram though for complex communications between systems.