I learned on the tables back in the mid 70's, then went to one of the old analog "Benzomatic" (pronounced BENDS- O -MATIC) computers in '77 (I still have it, btw-and NO, I never got bent on it, even though we often "pushed the needle" on the thing).
I bought a USD Monitor I around 93', and picked up a cheap little Matrix last year. I've had no training on any of these new digital 'puters, but after reading the instructions, none was needed. I still dive them both, using the Matrix as backup, since the big numbers on the MI is easier to read in dim light (and both are pretty close in algorithms, with the MI being slightly more conservative.)
I am still surprised sometimes, to run across divers who can't read dive tables. I recently observed a couple attempt dive on tables after one of their computers failed and even after trying to show them how, I don' think they figured it out.
I'm pretty sure, they just made the dive on one computer. Perty bad thing to do, but then again, they were pretty poorly trained, IMHO.
On some local trips, especially those to the Flower Gardens, over 110 mi. offshore, computers are a necessity. Table divers are at a real disadvantage since the dives are repetitive and multi-day at depths from 60-100'.