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In 23 years of diving, I haven't had to replace my tables.... wish I could say that about computers....
The funny thing is that up here (Great Lakes), the dive profile is basically a square one so it is easily figured with a Wheel or the tables. There isn't really the big advantage here that reef/wall diving gains in computer use.
Mine are basically square as well, as I am almost always right near the bottom looking for shells. For deeper or boat dives I use tables, watch and computer. For shallow dives (30') I don't bother with the computer (one less thing to wash). I have yet to hear my computer ascent alarm, but it's nice to know it's there.