In what OS and with what projects are you trying it? I'm using Lazarus since 2006 or so and the last time i remember it being unstable was back in 2008-2009. It has been a very long time since i even saw the IDE crashing, let alone getting a feeling that it is unstable.

(note that i'm using Windows and mainly with my own projects and components and i only use the components that come with Lazarus)