The regular Drake has a 1,000g map rating, while the Drake II has an 800g map rating. The Drake II uses a different bowl wash system, too. The II has the Double Cyclone flushing system. It uses two large vents that release water, instead of a series of holes under the rim like most standard toilets use.
This video shows a different model, but it has the same Double Cyclone flushing system used in the Drake II.
http://www.youtube.com/watch?v=YugiNeWIlME
How happy were you with the bowl wash on the regular Drake?
I've had the Drake II for about a month, and I haven't been super satisfied with the bowl wash compared to some other low-flow toilets I've used. But, the other ones I've used were 1.6 gpf units. I don't know how the bowl wash on the Drake II compares to some other 1.28 gpf toilets. It does flush very well, though.





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