HS515GM - circle/dot, backordered HS515CM - same unit as above with an added solar panel, currently available I'm wondering if anyone has experience with both, and which you prefer, and why. The main difference from where I sit is that the GM has the controls on top (thus easier to access with either hand) and the CM has the solar panel on top so they moved the controls to the side. For me, I guess the extended battery life would be nice but I don't think I can't live without it. I'm trying to decide if I'd really mind the side-mounted controls; I really like the top-mounted ones on my current unit and I suspect I'd be happiest with the same setup on the new one. And yes, TBH, I'm only considering the solar-equipped unit because I could buy one now, and the one I originally wanted is unavailable. Any thoughts appreciated.