My experiences, as one anecdotal point of reference. I have two Onkyo's right now, and they just keep chugging along. The refurbed 805 is, let's see, maybe 4 years old, acting as prepro in my movie theater. At the time, I would have chosen the Denon 3808, really the only equivalent at the time, if it wasn't nearly twice as expensive.
The little HTIB-Onkyo receiver that is back in my hands again while I hold my brother's HT system while he's out of town for a year, well that's survived even his abuse, though now all but one of the optical inputs are broken!
The only receiver that really has caught my eye in terms of desire/upgrade since my 805 purchase is the Denon 4810, but that $2000-3000 would really be better served with either new front three speaker builds, or towards an upgrade of my JVC projector (along with its sale, I could maybe get something truly nice).
You know, I'm sure Onkyo's do cost less for a reason, in many cases. But money doesn't grow on trees, and I always believe in spending the lion's share on speakers, display, and room. IMO, the prepro is easily the fastest thing to be superceded too. I initially bought mine with the idea that I might be upgrading in just a couple of years. I'm still hanging on to it.
However, it's acting only as prepro, set to 4 ohm mode, which lowers the heat, considerably. I now have a non contact thermometer, and I could take readings to disprove those people who don't believe me, but I'm not going to, as I'm certain enough for myself.
Good luck freaking out over Onkyo junk! So far mine has survived two different screens, two different subs, and a variety of speakers.