I've got a Vytec as well and have no complaints with it. I used it for some penetration wreck diving last week with no transmission problems whatsoever. And on the same topic, although the charter boat was relatively small, once I activated the transmitter, I didn't lose signal lock anywhere on the boat. Also, the unit is a good size and I've had no trouble reading the display in any conditions (night, low viz).
For the N2 loading graph which is prevalent on a lot of computers that you're obviously familiar with, Suunto obviously went a different route. As Scubaroo mentioned above, the NDL tells you how much time you have available during your dives, so if you keep yourself out of deco, that should be enough to keep you from getting bent (hopefully!). One additional indicator the CPU gives you regarding Nitrogen loading is that during your surface interval, an "alert" symbol will flash until the computer thinks you're ok to perform another dive. Not to mention "Planning" mode.
