The EU Go Federation has acknowledged Fischer Time to be used in rated tournaments as of October 2010. Would be nice if we also got it added on KGS since it's an 'official' time system now. To each his own.

Bronstein time is the only system missing. It divides the game into clear sectors.
1. Time to think
2. Time to move

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North Lecale

I actually like Bronstein very much as kind of "better byoyomi" that serves well for playing relaxed games and use it whenever I can. However there is no word about it from the EGF yet.

I think for serious games Fischer is better than bronstein, because it's not spilling and gives both players the same total amount of time. One way Bronstein degenerates in serious games is that players will wait until the last second of his per-move time to place his move in order not to spill his time.

For casual online games Bronstein sounds nicer to me, but since KGS doesn't implement either system I can't speak from personal experience.

Another interesting idea is mixing Bronstein and Fischer. So that after each move you get a certain percentage of your remaining move time added to your time reserve.

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Sanity is for the weak.

Some time ago I actually programmed a clock that does just that (I called it 'Bronstein Carry' ) and used it for a couple of games to test how it works out.
I found it gave very good results with a carry-over of 30%..40% of the remaining time of a move, basically combining the strengths of Bronstein and Fischer while getting rid of their respective disadvantages. However, this requires new clocks of course.^^

Uh apart from this off-topic discussion, I'd already be happy to have the "new" official EGF system aka Fischer on KGS for the time being.

For simulated Bronstein on KGS, see twoeye's (7d) games. He started out with ten seconds per play and 100 periods (equals 1000 seconds of think time). Recently he has reduced it to 50-60 periods. Still a more interesting approach than byo yomi or Canadian IMHO.

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Dave Sigaty
"Short-lived are both the praiser and the praised, and rememberer and the remembered..."
- Marcus Aurelius; Meditations, VIII 21