I never find myself waiting for the ipad to do anything but perhaps I am not doing much. touch an app and its open. Pinch and its closed. I read magazines, browse the net, look at manuals, write a few emails, take a few notes and look up contact details and keep lists. I can see where power is important on the tower where I create stuff but on the ipad it doesn't seem to be an issue.
I wont upgrade to the 3. With incremental improvements you have the choice of sitting every 2nd one out without really missing anything. I dont think Apple are the worst at forcing upgrades by a long shot. Over 10 years ago I bought a mac mini for image processing. When the MP race rendered ir redundant I hooked up about 12 hard drives to it via USB and firewire and used it as a file server. Then I upgraded to a NAS server and the thing ended up in a drawer for a few years before being dusted off, loaded up with itunes, connected to airport and with an ipod touch now does service as a music server in my house. It has never been opened and never gives any trouble. I think it even did a year or 2 as an admin accounts machine. Good value I would call that.
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