I just spent a few wasted hrs chasing up info on these bits of tech. If you want a pure vanilla motor, the alternatives to the big two are quite tempting on price. However, for these gadgets to be truly useful, you need the GPS option. And for this only the big two has it. AND only garmin or Lowrance are supported if you want to network. This means the only reason i dont have one is i cant afford it at the moment. If you think about the alternative, a drum winch, its not that expensive. In the interim, i will be buying a foam float for the anchor.