I'm really considering the international LTE/3G model (SM-T705) and using it to replace my GN3 on T-Mobile. Just concerned about being limited to the 1900MHz band, which is available in my area, just not all that speedy (or widely available elsewhere). I might even jump over to AT&T if it'll work better.
But with the right holster/pouch, I think it's quite doable. I already use a seidio holster (don't like things in my pockets). And I've been rather interested in Mighty Pouch, which looks like a pretty good way to carry around a large tablet while remaining portable and accessible. Already contacted them and they can pretty much make a custom pouch that'll attach to your belt, for just about anything. And probably wouldn't look entirely ridiculous like some solutions I've seen.
We'll see... my GN3 does get the job done. I just like trying different things. Heck, I might even keep both and just switch sim cards depending on where I'm going.