I recently bought an iPaq 6515 and so far I am pretty happy with its performance. My network provider is tmobile and since they do not directly sell iPaq, I bought an unlocked cingular iPaq. I love all of the standard features/applications that come with windows mobile.The built in GPS receiver is very cool and works well with MS pocket streets, free download for iPaq customers. The only thing that this model lacks is a built in wi-fi but the product itself is much more stable than the previous models (6300 series). It supports EDGE and GPRS networks for data transfers. The bluetooth seems to be little flaky at times. If you can wait few months then I would recommend HP 6900 series which is 6515 + built in wifi. If you absolutely cannot wait then 6515 is pretty cool. You can always gets SDIO wifi if you really need to have 802.11x.