Experience with INAX toilets?
We do not own an Inax, but we have a lot of experience with them. We travel to Japan at least twice a year. The toilets in both Narita International Airport (NRT) and Haneda International Airport (HND) are all Inax. Not to put too fine a point on it, but incoming international flights to Japan typically are at least 12-14 hours in duration, and one (usually two) meals have been served on-board during the flight; and restroom facilities often are urgently needed after (sometimes before passing through Immigration and Customs. The restrooms there get a lot of business. And they never clog. Many of the upscale international hotel chains -- Mercure, for certain -- have only Inax fixtures in the public restrooms and the guest rooms of their Japanese properties.
To the Japanese consumer, the brand images of Inax and Toto are like the brand images, respectively, of BMW and Mercedes: Toto the staid standard, Inax the aggressive style leader with cutting-edge R&D. Inax has been the first to market (often barely ) of many of the innovations that we in North America view as Toto inventions. At comparable price points to Toto (in Japan, Inax tends to be more expensive than Toto, model for model), I would not hesitate a moment to purchase an Inax.