I have had the chance to work with a couple of different synthesizers. The Moog Subsequent 25 is solid, stable, and has a great build.
This is not the most feature packed example, and there are a lot of synths with more features that cost less. Additionally, a two octave keyboard is small. There are five octave selections out front, but this is certainly not a fix for someone looking to play the 25 like a full sized keyboard.
Most all talks about the Subsequent 25 bring up the "under the hood" functions. There are a few, and they can be annoying at first. After reading through the manual a few times, they are all simple and easy to use.
This is a great synth that feels as though it will last a long time.