"Okay, so after doing some research during a bathroom remodel, replacing an old, low, janky ""rounded"" toilet, I decided to buy the TOTO Drake [original] single-flush 1.6 GPF [gallons per flush] ""universal height"" [slightly higher sitting for us tall folks] ""elongated"" toilet with Tornado Flush, or whatever it's called, here on Amazon. And I picked up a nice Bemis elongated slow-close toilet seat/lid with nickel hinges (same as the other toilet) from Home Depot, since I used it on another toilet and liked the design, materials, and slow-close.
Anyway, had my handyman brother install it with a Better Than Wax rubber gasket between the toilet and flange. Seemed like it was done relatively quickly. So, presumably, if you know what you're doing, it's reasonably easy to install?
So far, I've not had to actually scrub / clean it yet. It's only been installed a week or so. But, so far no problems, no tank flange/seal leaks, no external drips/leaks, etc. Time will tell if any develop. But, so far, it seems to be doing nicely.
Some advertising materials indicated a large ""water spot"" in the bowl [as opposed to some where there's nearly no water in the bowl], but I couldn't ever really get a good sense of what that meant from online materials. So, I've included a picture with the general water level in the bowl when the tank & bowl are filled and off, for reference, in case it helps anyone else.
It's a reasonably large ""water spot,"" contra some where the water just sits down at the very bottom and the rest of the bowl is dry, which can lead to bits hanging on for dear life. So far, that hasn't been an issue with this toilet. In the old bowl (with regular rim holes that just point downward), it was. With the new bowl it has kinda' like two swirly jets from the tank toward the top of the bowl, with another jet that pushes stuff directly into the drain pipe and a relatively rimless design, and it's stayed pretty free of bowl debris so far. And it seems like it'll be easy to clean without having to guess whether the under-rim area is clean or not (since it doesn't have an overhang for stuff to get under, just the bowl sides and two water jet outlets that swirl water into the bowl). Whether it will remain free of clinging debris over the long term remains to be seen, but so far so good...
Since it hasn't clogged yet, I can't tell if the space between the existing ""water spot"" [which takes up about half the bowl height (+/-)] and the lip of the bowl is sufficient to hold the water contents of the tank, if it did clog, or if it would overflow, strictly between the ""water spot"" + water from the tank. Kind of hope never to have to find out. (o_0)
The tank seem to refill fairly quickly. Can't say whether it's louder or quieter than other tank refills. There's definitely refill sound. Don't know that I'd say that it's overly loud, which I guess means it's reasonably quiet. You definitely still hear it, so it's not like it's silent. But it's not terribly obtrusive and tends to be fairly quick, IMO.
Overall, so far, I'm not disappointed by it. It's cleared everything I've put in it so far, as far as toilet paper and such and hasn't clogged one yet. Unlike the old small round toilet which would have a hard time clearing much of anything and frequently clogged with fairly, I think, average amounts of T.P. As far as that goes, I'm pleased so far, not having had to plunge it yet once. That's a nice change of pace. Hopefully that keeps up. Haven't explicitly tried flushing huge piles of T.P. like some advertising suggests it's capable of to see if it actually clogs, or of the swirling action successfully clears it. Maybe I'll try it sometime and get back to you... ;)"
