I don't dislike Aisin but what are you saving over the age and mileage of the average timing belt that you would want to take any chance on the parts, particularly a timing belt or tensioner on an interference engine? I don't understand the cost/benefit there.
To me the issue is not Aisin per se, but there is so much counterfeit junk out there, and I have experienced it and been burnt by it, that I would not take the chance anymore really with any brand of car or truck that I own.
I agree with your points, however there are a lot of OEM fakes out there too - arguably more so than with Aisin. Aisin is good OEM quality stuff. If Honda hadn't lost their minds on pricing I'd be happy to buy the parts from my Honda dealer, but frankly their pricing is just insane. Worse than BMW, Audi, or Lexus. So I won't pay their prices. I can get the entire kit from Aisin for the price of just the TENSIONER alone from Honda - even the "discount" online dealers. My local dealer charges OVER MSRP for parts and then makes you jump through hoops to get the parts since they got rid of the parts counter - you got to know a guy who knows a guy and then wait after you paid your king's ransom.
The Honda OEM tensioner isn't special - in fact it had the same exact casting marks as the Aisin one in the kit. I'm about 99% sure Aisin makes the tensioner for Honda.
The belt used in the Aisin kit? It's a mitsoboshi belt - they're a Japanese company that's been making belts for something like 100 years with a great reputation. Unitta (the Honda OEM part) was actually tsb'd / recalled for a bunch of defective belts for our engines a few years back. They made it into new Pilots even. I don't worry with a quality belt from Mitsoboshi.
The tensioner and idler bearings? They're both Koyo. Same exact as the OEM parts from Honda. Same bearing manufacture, same casting, same everything. Only difference is the bag doesn't say "Honda".
The water pump? It's an Aisin water pump. It's not a Yamada or whatever like Honda uses now (Honda used to use Aisin). Guess who else Aisin makes water pumps for? Toyota. You think Toyota uses Aisin because they're cheap junk? Nope - they use them cause they're one of the best water pump manufactures out there if not THE best. I've personally run Aisin pumps for two timing belt changes (just reused it on my Lexus) and I've never seen one leak or show any signs of wear. So I have no worries there.
Like I said - I wouldn't run a Gates or whatever timing belt kit but Aisin I have no concerns with. If Honda wants to sell me parts they should act like it.