Mr. Florian hits on the build quality at the beginning and a little in the end here on his video for the XFM.
I agree with him the XFM and Bass&Beats that I had in the past felt pretty lightweight and plasticy.
I actually had to loosen the screws around the body a little on the XFM because when it arrived the top surface showed stress in the plastic where the screws went into the posts. Like divots in the plastic. But that was just the XFM. The B&B was fine.
I’m hoping the plastic quality is improved some, but I expect the Mega Synthesis to feel the same since the Livens all seem to be using the same mold. Makes a lot of sense from a production efficiency standpoint.
Knobs are the same feeling plastic, but the encoders moved fine and had a comfortable resistance.
The keys get the job done. No velocity and not much travel. I do like how much of what would be menu pages are right there under the keys via the shift button. Makes working on a Liven pretty breezy even though the display is a simple LED.