Summary: I started out with a HP 1940 iPAQ and decided I needed (?) a wireless one. I have used a HP iPAQ hx2410 for a couple of years. The original was purchased used on ebay and the second one was also. My first iPAQ began to have on/off switch problems. I could not depend on being able to turn it on or off. I purchased a second identical model so I could use all of the software I already had for the hx2410. The newer one is quite satisfactory and was not very expensive.
Summary: I use these PDA's for my work as a forester. I have installed forest inventory software and enclose the PDA in an Otterbox. The computers have never failed in all types of weather-- rain, snow, five below zero, 103 degrees... I bring the data back to my home computer, sync, and what a great time saver. I prefer the older models, because I have no patience to continually update all the software.
Pros: Solid construction w/all the bells and whistles. Nice feel in hand and not heavy like some suggest. All wireless features. Protective screen.
Cons: Bit pricey compared to Axim X30 but Quality is superior. For this reason I returned my X30 and am picking up the h2410. Also, you can find better prices if you know where to look on the internet.