Bought one of these "sawed off" ESS AudioDrive 1868F cards for next to nothing.
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I mostly got it because a) it was super cheap b) I was curious about ESFM and its native 16-bit AudioDrive mode for DOS games. And while ESFM did thoroughly impress me, I'm not all that sold on the AudioDrive mode. Granted, I need to run some more tests, but so far, the results have been very mixed.
Some games do sound nicer in that mode, but others become muffled (filtered?) and a few even appear to be downsampled (e.g. WarCraft 2). On the plus side, its SBPro mode is superb. In that mode, the card sounds clean and vibrant and appears to be very compatible as well. Also, it produces no noticeable noise with the jumpers set to the "Line Out" position. As for ESFM, to my ears it sounds very close to genuine OPL3, sometimes even a bit cleaner if that's even possible. Definitively keeping the card.