Well, finally got my sig150 today. I really like using it, but the button is TRASH. The first thing I noticed when I took it out of the box is that it literally sounds like a baby rattle. I thought maybe there was some loose piece of plastic or metal rattling around inside the thing, but no, it is the firing button. When pressing the button, it crunches and grinds and locks up and snaps down, it is awful. The only way to prevent this is to line up the tip of my finger dead center on the button and push precisely straight in before putting it up to my mouth. The 5 button pushes in rapid succession required to power on and off the device usually takes several attempts. One or several pushes tend not to register, even if it feels like they have been successful pushes. It is hard to imagine how such a small button can even fit such a large amount of loose tolerance in it. You may think I am exaggerating, but I genuinely cannot recall pushing a worse button on any device of any kind before.
Aside from that, the chip has some glitch where, when powering off, it says "system off" but then goes back to the normal screen for several seconds, but this is intermittent and not a big deal.
I am never going to pay the shipping (plus "administration fees," required to be paid before sending it in for warranty work) and then wait (several weeks or months, I would assume) to get it fixed, and the place I bought it from is now out of stock, so I will probably just engrave "Maraca" on it in fancy lettering and live with it.