After using it for a while, I am completely satisfied with the Xperia, which is unusual for me. I got the 32GB version, but see no reason not to get the $100 cheaper 16GB version. Better to spend the money on a couple 64GB microSD cards.
I use RawDroid for photo selection/deletes. The Android Photo Review app was just too clunky of an interface, and didn't allow image deletion. My ancient 5D2 and 20D use CF cards. To connect, I use a block type USB adapter and a female USB to microUSB adapter cable. Transfers are fast (Sony has a decent built-in transfer app that auto-runs when the CF card plugs in) and it's nice to have an effective backup for the CF cards. At home I use the ES File Explorer app to transfer images to more permanent storage. It is an excellent file browser that maps drive connections to all kinds of file stores/systems, including some cloud storage types. I can transfer to my web server, image store or up to GDrive/SkyDrive/Dropbox, etc. with it. Great free app.
On the road, I have been playing with Gaia for navigation and c:geo to find geocaches along the way. I have been based in Windows/NG TOPO! and swap tracks/waypoints back and forth via GPX files. Gaia's import process for tracks and waypoints is pretty good, but takes a bit to get used to. It does have what I consider a bug in that anything you do getting outside the main map view will revert your zoom to Level 10 (then it takes a few seconds to re-zoom back to Level 15). Gaia also has the benefit/detriment of a lot of different map sets to choose from. Choice is one of the reasons I am behind Android as a platform. Still haven't worked out a good "on the road", "slow topo nav," and "topo alternative" favorite map set. It gets worse having to choose and plan for offline maps.
Sony has a neat dual-app feature that lets you have mini versions of apps or widgets on the screen at the same time as your main app. I haven't played with it much, and I think Samsung has a better version of it, but you could have a simple music control app up at the same time as mapping, for example.
The GPS works well, and with the GPS Status app the GPS seems to work even better via some kind of voodoo magic. I also use a few gee-whiz apps like Sun Surveyor to predict sun location, Google Sky Map, etc.
At home there is all kinds of media integration possibilities, more if you have some other Sony devices. It also can be an IR remote control. I have been using youtube integration with my PS3 (tablet lets you navigate and queue videos), Netflix and HBOGO streaming using an MHL adapter for HDMI output. I can also use the tablet as a DLNA server or client (MediaHouse app).
Battery life has been great, and not having had a tablet before I didn't realize how light it was until I compared with friends' tablets. Sony has an anti-shatter screen protector stuck on very well so you don't need to buy additional screen protection until you need to replace it. I've read people buying matte overlays to cut glare but haven't felt the need to do so. I have a cheap neoprene case that barely fits (made for more square tablets) when not in use, and have a RAM mount X-Grip III that integrates into my RAM setups in the trucks.
