The IMRs are great for mechanicals... But the Telescope is, IMHO, about the worst mechanical out there. The switch in particular is awful, and there's a wire that runs from the positive battery terminal to the head, making it just barely a mechanical at all.
I don't know if recent Telescopes are still built the same way... I ditched mine long ago, but I was extremely unimpressed with the one I had.
They are much improved now. I've had mine since Oct. and it's working like a champ. No switch problems or any other problem for me.