I have an elite and elite t3. i used them till i got my shearwater and never went back to it again. Ignoring the tech aspects of it , I like it because of the ease of navigating the menu's. left button scroll and right select. Thats it you dont have a 6 level menu system and I can aactually use the computer for more than the default screen. The t3 need the manual to change gasses. the shearwater is left button over and over again till you get to "select gass" right button and it gives the list of gasses you put in the computer. left button to scroll down and right button to select. I have played with lots of puters and my shearwater is the easiest to operate. get your self a petrel 1 or 2 if you want the compass and you will never look back. So i guess in short pick your next computer for ease of use.