A poster after my own heart. An icon of the Lady of Pain
I haven't handled the Prime yet, but it's supposedly very much similar to the ASUS Ultrabooks, and those are pretty sharp. Performance is supposed to be quicker, though not on every single app.....I guess it depends on whether an app is programmed to work with all four cores or not.
Screen brightness is supposed to be way up, with an outdoor mode that makes it possible to use outside in daylight. Battery life is better. Given the TF101 gets pretty strong battery life already, that's not bad. Depending on what I do with mine, when docked with the keyboard, depending upon how much I use WiFi, mine gets between 15-20 hours on a charge already. That's actual use...not just standby. Some apps are worse at draining the battery than others....same as with iOS.
How much use you'll get from it will depend on what you want to use it for. I use mine a lot for work. It's a great companion for meetings, and now with Photoshop Touch and Photoshop Proto available, I can work on laying out ideas for clients right there. The Prime improves on the video playback capabilities of the TF101 (which has issues with H.264).
With the USB ports, the Transformer series can actually work pretty well as Android based netbooks. Mine's pretty much replaced my laptop for everything except hard core word processing or more detailed Photoshop work (I don't use my laptop for gaming....I have a more powerful desktop for that).
The areas I see mine lacking vs. an iPad 2 are that the battery life is a little shorter (though not by much), and with the dock added, the battery life is better, that there don't appear to be as many games or entertainment apps (though with the recent $0.10 sale, it feels like the problem may be more that the Market isn't as well organized as the App Store). E-mail integration works much better than on iOS (phone version). I can actually search for emails by keyword, and reliably find what I'm looking for, even if it's months old. The TF101 doesn't feel built as nice as the iPad 2, but the Prime upps the ante, and is apparently quite solid.
The ports are useful....being able to move stuff on an off portable hard drives, print over the air to any printer (not just specific models), plug in a game controller and use it, or a wireless mouse, or even a wireless keyboard, or any number of other peripherals has been useful, as I tend to prefer a separate mouse over a trackpad.
Some reviewers had issues with weak WiFi...but apparently this appears to be a problem with early review units that has been corrected for the models being shipped to the U.S. for consumers....unless that's just a PR smokescreen. Hopefully not. Sites like Anandtech that had those problems reported receiving new copies that worked much better.
The TF101 is my first device, but I love the customizability. I've switched out my launcher and keyboard, and have also thought of switching my multitasking tray, as well as my text to speech engine...though I haven't gotten around to those yet, as the ones that are already there don't bother me enough. One thing I noticed....if you replace the keyboard, the software keyboard replacements don't work with the dock. If you keep the replacement "turned on" while the dock is installed, the dock won't work, you'll get typos galore etc. You have to turn the replacement keyboard off, and the dock will work properly. I guess the app makers didn't account to think of the ASUS dock.
Banshee