Speaking as a Kobo Glo owner who hasn't had any hands on experience with much else:
- It's super easy to move files on and off of the Glo. It's handled pretty much every file I've thrown at it.
- A big bonus for me is that I can easily borrow books from our library using the Kobo (vs. Paperwhite).
- Light is great; very even except for a little bit of shadowing right at the very bottom (which Kobo has cleverly hidden by putting a black bar at the bottom of the screen when the light is on).
- So far I've had no huge problems; plenty of highlights & annotations in many books. Dictionaries could be a little stronger and it'd be nice if highlighting text was a tad quicker, nothing unbearable though.
- There's some chinks in the armour when you're really playing around with it a bunch, and yes, I'll often come across a problem or two if I'm doing that. When you're doing what they were meant to do: reading, the experience is wonderful (save for the bumps with the 2.3.x firmware, but we're past that now).
- I use it every single day and love it. Don't regret the purchase one bit. Calibre makes everything double great.
- You'll see lots of arguing about the colour of the front light; on mine it can look like it has a slight blueish tinge or slight yellowish tinge depending on the ambient lighting. The fact that it can flip back and forth goes to show that it's actually relatively close to white. Mine is closer to white than a Paperwhite I played with once, and even when it looks a little blue to my eyes, it's not distracting in the least.
Even with some of the firmware hiccups, I wouldn't hesitate recommending a Glo to anyone who's interested, especially if you live outside the United States. It's a solid reader with a plethora of features. My experiences with Kobo have been good and it's been fun to go along for the ride and see the entire package slowly mature and become more robust, even over the past 6 months.