have you used said OS on a modern, native PPC machine? Did you personally apply the 4.1 u3 update yourself on a system?
First - you made an error by using the words "PPC" and "modern" in the same sentence; yesterdays ARM *smartbooks* are
on par with Sam440. Current ARM Cortex-A9 smartbooks are
on par with G4 (AFAIK, the Sam 460 isn't really) -- and the G4 had its peak half a decade ago!
Did you personally apply the 4.1 u3 update yourself on a system?
No, it was a very long time I owned a OS4 system, and I have absolutely no reason or ambition to ever own one again. I can't see a single benefit of an OS4 system over a MorphOS system, and it doesn't look like this fact will change anytime soon.
If the answer is no, you have nothing but hearsay to go on, sorry - Talking head nonsense.
Some "hearsay" also say the upgrade worked flawless (there has been many users closing up behind Hyperion to show their support in this after the **** hit the fan), but there was also a *massive* (relatively speaking) - even for an OS4 release - testimonies from respected OS4 users about the quality of the OS4.1.3 release. Denying this is futile, someone started to compile a long list of references of issues over at moobunny, or maybe it was two lists even, and if I would spend an hour browsing through AW.net, Amiga.org, Hyperion's forum, and moobunny, I am pretty confident I could present you with quite an impressive list of a significant number of people, most reporting more than one issue, and not few of them are of a *fundamental* kind. I can easily do that this afternoon. Do you want me to?
Edit:
In various forums presenting this "advent of OS4.1.4" news item, there are many suggestions of what bugs users hopes to have fixed. And new testemonies of OS4.1.3's "quality" keeps coming in as we speak, this was from *yesterday*:
"Same here, update 3 is really slow, slower than my windows 7 machine at booting, seems over a minute now, and the start up sound stutters like crazy." http://amigaworld.net/modules/newbb/viewtopic.php?mode=viewtopic&topic_id=34424&forum=2&start=20&viewmode=flat&order=0#633014 "I can only compare my Mac mini G4 on MOS and my A1XE on OS 4.1.3
From cold MOS boots for me in around 10 seconds, OS 4.1.3 in around 1 min so there is a substantial difference, but as mentioned earlier, update 3 seems to have made the boot around 10 times slower than it was previously, I just look at the boot screen for a good minute or so after UBoot, not sure what change slowed it down so much." http://amigaworld.net/modules/newbb/viewtopic.php?mode=viewtopic&topic_id=34424&forum=2&start=20&viewmode=flat&order=0#633016 OS4.1.3 boots multiple times slower than OS4.1.2, there are no rational reasons to explain this vast speed decrease other than something must be borked.
Look, there is a reason to why they announce an OS4.1.4, and it's *not* because OS4.1.3 was a good quality release, it's the very opposite. Why is this so hard to grasp?