...and it works with my Targus Bluetooth keyboard. Actually, it works better than it does with the GP5. The Samsung has some key-mapping problems, probably due to Gingerbread.
As to reading, I happened to be starting a novel the other day, and started it on the Nexus 7. I had no problem. I did keep the brightness on 'Auto', so the light level of the screen matched the ambient light. With the GP5, matching light levels was a little chancy, so I had a bit more eyestrain. (Of course the extra 2 " of screen have no bearing on that, right?)
I did try the freebie 'La Luna' video that Google gives away. It watched fine on the 7" screen. The thingk I really like is that there is a 7" screen in the weight of a past-technology 5" package. I owned a Nook color for 13 days, but took it back because of the weight and balance. It just wasn't comfortable to hold.
I haven't tried any significant music listening. I suspect I'll still prefer my Clip+ for that. The Nexus is a little large for that purpose. I also haven't tried the camera in any particular serious way. A selfie and a picture of my cat isn't much of a trial.
Again, I'll probably use a purpose-made camera for real pictures. I also havent explored portability yet. In the case, it's a bit bulky for easy transport, whereas the GP5 fits in my pocket next to my cell phone. I probably won't put the N7 in my pocket without a case. It's a little large and fragile seeming for that.
Regards,
Jack Tingle