I wouldn't loose any sleep but then according to the forum echo chamber I have the only 4 perfectly working Onkyos on the planet.
My 875 is still working great after using a 200mm fan on top since I bought it.
I think that the lack of a fan is probably all that is wrong with most of them.
But its very hard to ignore the diabolical customer service they have demonstrated.
If you have a problem, its likely to be very costly, frustrating, time consuming and fruitless.
This will be my last Onkyo purchase, despite being very happy with my 875.
I'm not a sucker for punishment.