First off, hi everyone! This is my first post in the watering hole so be kind. Looks like an interesting place to hang out. I'm currently rocking an S3 on Sprint (waiting with baited breath for them to turn LTE on in my area this month) as an upgrade from an S2 (which was my digital appendage for a year).
Caveat: I also keep an unlocked GSM Galaxy Nexus on the side for T-Mo and all the comparison goodness.
My latest endeavor is to try and use this newfangled Google Wallet I've setup. I see a trip to Wawa in my future.
My favorite addition to my S3 is the Aquarium Live Wallpaper. With the S3's native water sounds, it makes a perfect visual companion.
I have had bunches of tablets over the last 2 years, ever since my iPad1 days. I always got a WiFi-only unit and used my prepaid MiFi card if I absolutely had to have 3G service. It has never been a problem for me because I'm usually near WiFi and when I'm not I just consume the media I have on the device: music, video, e-books, games, etc. A lot of my apps work offline (Evernote, Calendar, Contacts, etc.) so I can add content then have the device autosync when it gets near WiFi.
Only time I really miss that 3G connection is when I want to use Google Maps or check the weather radar, but then my phone is handy.