I have a Tusa IQ-800 (and a Suunto Cobra and others). I like the vibrating feature because I am hard-of-hearing at 2000 Hz and above. I can't hear most electronic alarms because they are too-high frequency; so, the Tusa IQ-800 is great in this respect. Like the large display; and, even if I can't read this large display I have the vibrating alarm. Another alternative computer is the Mares DiveMate. It doesn't vibrate; but, it talks to you. You can ware it on your dive mask strap such that the computer's speaker is next to your ear. It gives you your depth, no deco time and a warning if you ascend too fast. Again, great if you can't see your gages or read the display. Mark