Hey Bill... I have a spare tailmount micro you can try if you want to go the backpack route first. It's brand new, so if you end up using it and like it you can buy me a replacement at your convenience... (or you can return it to me attached to a merlin lol).
Or buy the leg/neck mount one if that's what you're leaning towards and if you don't like it I could trade you or you could return to Marshall I guess. FYI - if you want to try neckmount, I have a big box of rubber bands that should be the correct size and can send you a few hundred. I used them w/ my kestrel, I think it's the size Eric had mentioned on his web site.
Hope this helps...
-Ken
(Maryland/Pennsylvania)