Yeah, i about left palm over the 755p that never got updated and when it did, we were already looking at other things. Even the update (after more than a year) bricked a number of phones.
Still, the bugs seemed to be more hardware related. The centro finally seemed to be palm's end of evolution device for its palm OS as i heard the hardware was redesigned totally. In fairness, it works great. It's a great form factor, comfortable to use, snappy, and didn't have some of the annoyances of prior treos.
This is a weird era. Many have already complained the palm OS is aging and doesn't fill their needs and i just shake my head. Now i'm only from a sprint point of view (no gsm) but the centro is only limited in that it can't multitask, can't offer gps, or wifi. I think it could link with a bluetooth gps and i'm pretty sure you can put software on it to enable stereo BT. In addition, i've not seen an app that can do what Call Rec can.
But..i wouldn't think multitasking is much of a demand for most users. The iphone isn't. Only Wm is and to be honest, it slows down if you really take advantage of it.
Wifi is another i would hardly use since the Centro was 3g ready from the start on sprint. GPS isn't either, but that's just a personal thing since i already have had Garmins from years ago.
So, yes, its the same palm OS, but yet it's still superior in a lot of ways to the most modern OS's. I tend to think its more about the looks. People got tired of looking at the same palm icons. Or the same hardware. IMO, palm could easily add cosmetic touches, call it an OS update, and people wouldn't harp on it as much. It's probably why Touch Launcher is the number one palm app right now. It provides a different look.