This is an update: I purchased two Toto Drakes with SanaGloss almost a year ago. Due to natural disasters, injuries, illnesses, and various other lemons life has thrown at us, we've only installed one. It is currently the only working toilet in the house with four people (one of them is large enough to be two people-- and eats enough for three people).
The Drake is the first low-flow toilet we've owned and it took some getting used to. Certain people with digestive problems tend to spray diarrhea all over the bowl (above the waterline-- which didn't happen in the old toilets because the water level was so high). I imagine the SanaGloss would work fine if the toilet was cleaned immediately after. Unfortunately, the offenders don't clean up after themselves and I've been left to try to clean it up. I really have to scrub to get that stuff out. (Are there any special toilet brushes that are safe to use without scratching the finish?-- I think the SanaGloss finish in mine is now pretty much ruined from having to be scoured). Cling gel has made the cleaning a bit easier for me, but I don't know if it is worse on the finish-- the bowl is so stained now that I think the point is moot.
I'd also like to note that I was ignored when I told people in my household not to use the blue stuff in the tank-- and it will stain the bowl around the waterline (I'm not sure if this is permanent because it was covered by the iron/rust stain). Also, if you have unfiltered/unsoftened water like me (and have a lot of iron in the water) it will stain the SanaGloss. The water from my faucets comes out anywhere from yellow to red to brown and tends to yellow everything (I'm working on getting a water softening and filtering system setup, but we will need to pour cement first).
The toilet itself has only clogged about two or three times (not counting the past few weeks because the septic tank overflowed) and was easily cleared with a plunger. Even when clogged, I didn't really have an overflow problem until the septic tank got too full (we think maybe the overflow pipe from the septic tank needs to be cleared). Our old toilets were clogged once or twice every month, so this is a vast improvement.
The only other thing I will mention is that the lid on the back doesn't have a lip to hold it in place so it tends to slide when bumped. It's not a big deal, but its something to take into consideration if you care about that sort of thing.
Overall I'm still satisfied with the toilet. If you're not used to low flow it can make cleaning more challenging, but it flushes well.
I hope this made sense and was at least moderately helpful to people. Mostly, don't make the mistakes my family made. Get your water filtered first and don't use the blue stuff! (And if you are a sprayer-- please show some courtesy and wipe the brown away immediately so it doesn't dry on and stick).