what do you think about this e-collar?

i just bought a DT Micro iDT z3002 Super 2 Dog System. http://www.gundogsupply.com/dtmiidtsu2do.html

we were roaming around fleet farm this last weekend and stumbled across this one. 239 for the whole setup with the remote, both collars, charger, and test light. i didn't think this was too bad. it has a 900 yard range, just a hair over a half mile. for what i do, this is plenty. i have been told that whatever the range is rated at, cut it in half. so, that would put me at about a 1/4 mile. which to me is still alright.

i used a DT H2O series last fall and liked it. this one has the vibrate button also so you can "page" the dog rather than a shock. the only thing im not too keen on is the on/off switch. the collars have a magnetic switch inside them. there is a little red dot on the collar and another one on the remote. you hold the two together until the red light comes on and starts to blink. you do this again to shut them off. not so sure if that is a good thing or not.

anybody else use this collar? if so, do you have any opinions on it?