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I've had my rz1710 for almost 2 months. I love it better than my desktop computer. It's simpler to use than the high tech fancy pantsy tablets, androids, surfaces, and blah blah blah. I have no plans on getting any other hand held computers. I will get an iphone(an older model) if I get the money, I'll get a Laptop, I'll get a camera, but I won't get any of the new stuff. Sorry.
I like technology that is easy to use. I don't want to end up throwing a five thousand dollar piece of equipment out of frustration.
I'd recommend getting one. They may be retro and out dated, but they're simpler, easier to use and are less expensive than what's being advertised these days. Plus it will give the people who made PDAs extra money as a thank you for inventing simpler easier-to-use gadgets.