Dont have one but have played with one. Its a good piece of kit, especially for the money. I use a Compaq iPAQ 3850. Bit old hat now but I love it to bits. It even goes to bed with me- really. The Axim is very similar to the iPAQ.
The main thing is the Windows based O/S. It makes life so easy when synching. I dont think you will be unhappy with the PDA especially when you consider the price - Oh and the fact that its DELL too.
Go for it I say. Cheers - Paul