Here's an update to my (nearly) free MDA from T-Mobile Experience.
Surprisingly, it is mostly positive! From ordering my phone and plan, modifying the plan, canceling my old plan, receiving the MDA by mail, and setting up the MDA with WiFi and (after a minor blip) Bluetooth with ActiveSync, internet browsing, and Skypeout service. I hope others who have an MDA can benefit from my positive experiences.

After researching, here and on other websites, magazines, etc., about which PDA Phone was best for my needs, I selected the HTC Wizard (T-mobile MDA). Several days later, of perusing Craigslist, Ebay, Letstalk, Amazon, etc., I was determined to forego my first objective of buying a cheap, used MDA as a replacement for my now out-of-contract T-mobile service. However, there aren't any cheap ones; just plenty of expensive (read: overpriced) used ones that people are dumping all over the internet.