That was discussed in another thread and I almost pulled the trigger on it. Any idea of the dimensions? I'm intrigued by the Piccolo because of just how tiny it is. I wonder if the Temon is similar-sized? I guess I could deal with cosmetic flaws if it's that cheap. I also wonder how the switch is, whether it uses a spring for battery contact.
See, now I'm just being picky. But I hate buying things I later don't use for whatever reason.
The Temon, G16 and Piccolo (not sure about the new one with the contoured tubes) are the same size. You can swap tubes between the caps/buttons. The G16's, Temons and Piccolo v1/v2 have a spring that is attached to the post in the top cap. You should be able to replace that (definitely on the older piccolos) with the GP telescoping post.
The Temon switch is a bit different than Gus, but it does the same thing...battery sits on delrin, push the switch and the contact comes up to hit it, pretty general bottom button design.