I have a Samsung SyncMaster 940MW that I bought because it has every video connector and sync rate known to man+dog on it. I use it with my IIci without incident, but this is through the IIci's built-in video circuitry. I have an adapter that came with my NEC Multisync 3d back in the day - it converts the Apple wide 15-pin video to the compact/dense 15 pin VGA-ish video connector. I believe it's passive - there's no extra circuitry involved.

Now that I think about it, the colors do look a little washed out - but it's very workable.