Well, the question is, is this device worth leaving one carrier for another. Pricing and all carrier related things aside, I would say no. Not as long as you are a hard core Pre fan.
You are right, ALL issues that still are, were there with the Pre - and Pre + aswell, but this does not make it better. It makes it worse as best. We are talking about very good hardware (and yes, the CPU alone is one of the best you can get) that underperforms due to the lack of time invested into building a decent OS.
Honestly, everyone with a sane mind must say that iOS and even Android are, from the point of a mature OS, years ahead of WebOS. Not concerning funcionality, just looking at the current state of the Software. This means, that a user buys a phone and does not need to think about or care about the stability of software.
I mean, how friggin hard can it be do fix an Alarm? The most simple and probably important thing for many people using a phone? Not to mention a ton of other issues: Contacts sometimes not being displayed properly, phone shows inconsistency on the dial pad, sometimes leaving the screen black, problems with syncing emails etc.
Do not get me wrong, I REALLY like WebOS, but you have to be fair and tell people asking, the truth.
So yes, if you are looking for something else with quite a list of bugs who "might" NOT be fixed any time soon...if ever, then go ahead and switch your carrier for the best of using a Pre!
But, if you are looking for a mature OS without bugs or at least with a decent Software Support...then NO, under no circumstance switch a Carrier for this phone.
All in all, I do still think that WebOS is worth the hassle for me....but I can for sure not talk for anyone else. I would not recommend this device for a "blank carpet" phone user looking for a decent Smartphone.