I just got a T-Mobile MDA, which has full HTML (i.e., not WAP) Internet browsing.
I have had it a few weeks, and so far I'm very pleased with its design and functions. I can get on the Web via GPRS from anywhere (or via WiFi from hot spots), go onto radar sites, blog from it, open PDFs, read/edit Word documents, etc. Of course, it's a mobile phone and camera, too. And given all this, it's surprisingly small and portable-- like, I have no problem holding it up to my ear for a long conversation.
I expect it will add a lot to my hurricane-chasing activities this year, both in terms of better information/communication access and just-plain convenience.
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I considered the Treo products-- they come highly recommended and are nicely designed-- but in the end, I wanted a Windows operating system. I'm just much more comfortable with that platform. But it sounds like you're very happy with your Treo.