"I wanted to share this unique experience that I had with a colleague of mine. Now please remember I loved my 600 and still like many aspects of the 650, ie the form factor, but due to the demands of my job chose the 6601 as I felt it suited my personal needs more. I have a fellow manager with the 650 who always made a point to laugh at or put down my 6601 until he had to still carry his laptop around on two trips we took together this last month because of the limitations of the 650. I was able to leave my laptop at home each trip for the simple fact my phone has Wifi capabilities. He constantly pointed out how much bigger he felt the phone was over his 650 (though in reality was not a very big difference). But let's see....a couple mm bigger phone or a treo 650 with a laptop, bag, and all necessary accessories....which is more convenient?"
There's been many Treo 650 vs. Audiovox PPC6601 (HTC Harrier) comparisons as both phones appeared on Sprint at about the same time. PPCT member HobbesIsReal chimes in with his personal story on why the PPC6601 (with an add-on WiFi card) worked well for him. If you've been debating between the two, you might want to give it a read yourself... and please post comments in the original (linked) thread.