Not a Pre, but I'm still "rocking" a Pixi Plus.
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webOS is freaking brilliant - so much so that I've pretty much pledged my undying loyalty to it despite it, well, being almost dead.
It does have quite a few bugs and issues, which could have been worked out if Palm had had the resources to do so. But it's still miles ahead of any other mobile OS I've ever used in terms of ease of use and design. I'm still quite peeved at HP for royally screwing webOS users and the platform in general.
The hardware is... less than good. I've had to buy three new back covers since owning this phone, they just fall apart. But props to the keyboard on the Pixi; never have I been so comfortable and quick on a phone before.