all the other GPS transmitters I have seen are HUGE. I would never put one on any bird other than an eagle maybe. They just look UGLY.
I would choose a small battery and short life span over a huge transmitter and a longer life. I see this as a VERY useful tool (not just a retrieval device) that will revolutionize longwinging (if it works as good as they say). I would also never use it as a solo unit and have a back up transmitter (forces me to do the right thing
) If it works as good as advertised I see it as worth every penny.