There would be no point to counting down a deck in 10 seconds as no dealer will every deal out even close to as fast as that. You need to be able to count down twice as fast as the dealers deal.
Consider a dealer who deals to cards each to a 7 player table in 15 seconds (which is quite fast). That makes 8x2=16 cards. 16 cards in 15 seconds. So let's say the average dealer deals about one card per second. You would need to count at least 2 cards per second to make sure you have little to no errors.
An advantage is that the cards are left on the table so you can wait after the dealers has dealt 2 cards to each player and then count. You can look for combos that cancel out, etc.
Basically you'll need to be able to count a deck down in 25-35 seconds without error.
As for other systems, you can check out a list at
THIS site...
Cheers,
Shanku