i see a lot about transmitters here, but most serious divers and virtually all tech diver eschew them. dont waste your money. why pay hundred of dollars more for an unreliable piece of kit (people who have no problems with transmitters just havent dived enough, i dive every day as a pro, and have seen more units fail than units that work), when a much cheaper mechanical version is available and reliable. keep it simple. all that said, if you are going tech, none of the mentioned machines is appropriate. 3 gasses is just not enough. look for a vr3, vrx, shearwater, hs explorer, nitek x, or the x1. all in the same price range, and good for real tec diving, and will grow with you as you progress. ive always wondered who buys this stuff, someone must, cause the companies keep making and selling half-assed gear. theres a sucker born every minute.
that being said, i love suunto products, very reliable for the most part (if you ignore the mosquito), i use one for tec diving too, but just in gauge mode. 1500 bucks is a lot of money for a bottom timer, tho. Id buy a rolex instead.