I have been using my MDA (UK Version) since November and I would say that if I were back then again I would definitly do it. However at this point I am not so sure I would. Now the reason I say this that I am not a big fan of the slide out keyboard. In addition to that, the lousy RF on this thing is really starting to get to me.
With that being said there are a slew of new devices that are due out in the coming months. If all you need is email, text and some internet surfing, the HTC Excalibur is due out on T-Mobile soon. It is roughly the size of the Samsung i320, it runs smartphone (not sure on this one) and has a static keyboard. Also, you have the new iPaq 6900 series with a 416mhz processor, built in GPS and running full Pocket PC with AKU 2.0. There is of course the HTC Hermes that has been released and is a beefed up version of the MDA if you like the slide out keyboard. And finally, the device it looks like I am going to get on board with, the new Palm 750. It runs Windows Mobile 5.0 with AKU 2.0, has no antenna and is triband UMTS.
Just my .02. i do like the Wizard and if you need a device now, and cost is a consideration then you would be fine with going back to it.
T-Mobile MDA Vario