Spooooooon!!!!!
It works well in Runequest (BRP) and Feng Shui. It was a flop in AD&D. It generally works better than you might think, but there are drawbacks.
A system where your number of actions is determined by how long those actions take and not by an artificial round structure. At least, that is what I meant by it in the OP.I have been out of gaming for a few years, but what is a Tick initiative system? Is that like Hero systems with action speeds or like Star Fleet battles and movement phases?
How does the system translate the high-good number of successes into a low-good tick of your first action?In the White Wolf games everyone rolls the die poo,l for wits awareness and the number of success is when a person acts.
When was there a tick based system for AD&D?It works well in Runequest (BRP) and Feng Shui. It was a flop in AD&D.
As Crothian said, like what? Drawbacks I night not have seen was a large part of the motivation for starting this thread?It generally works better than you might think, but there are drawbacks.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.