My partner and I use them often while fishing and hunting. Motorola has always worked well for me, except when dropped in a creek.
The advertised ranges are approximate though, in hilly terrain it is often less than stated. I could imagine dead spots on board as these are basically line of site devices, too much between them and nothing. Bass Pro Shops or Cabelas have them on sale sometimes, often a two for one deal. You can check them both online.