I like it, only used it a few times yet, but it will get more usage in the future.
Pros: stable, sits where you place it, grabs your amp well enough, even for very small amps I can add a small block of wood to have a better grip of the clamp, good price and build quality and I like the green rings it comes with :)
Cons: the arm itself has only one angle adjustment, for the other angles you need to articulate the mic holder itself, which is not a problem, but you might need to repeat the adjustments a few times til you nail the position you want.