I just got a new square top from calvert as well (at least they remembered to put the logo on your sail!). They actually sent battens with mine and you do need a "cap" on the end of the battens with that type of securing device. I am curious about what people think of this system as opposed to the traditional strings. seems simpler... more positive but certainly adds weight.
BTW.. I am a big fan of the leech line- more typically found on monohulls but it is a nice addition.