I won't make a judgement on the additional cost and an ability to float is nice but not necessary for me. The single tether point was enough for me because it acts as a back-up to the dedicated pocket on my flotation vest. The tether goes through the pocket to the vest. That said, with the new attachment system the pocket is unnecessary as the PLB would lash firmly to the vest and appears to be totally operative while attached. With mine it needs to be removed from the pocket to release the antenna and activate. I kinda like the newer version, but I wouldn't look at price. How do you intend to attach it? Will it ride in a pocket or be attached to the outside of a vest? That's your call.