IObservable vs Plain Events or Why Should I use IObservable?

Question

Microsoft introduced the IObservable interface to the BCL with .NET Framework 4, and I thought, \"Great, finally, I must use it!\" So I dug deep and read posts and

Answer 1

Observable is the cornerstone of the Rx library. They provide pretty much all the implementations and operators you'll need. The idea behind IObservable and Rx is not just the "handling" of events, but enabling "LINQ to Events." So you can easily compose "event streams," which gives you a lot of power compared to regular event handling.

Note that the sample MSDN implementation of IObservable is incorrect; the doc team has been notified.