SM-P605 vs SM-P600
I'm going to focus on the SM-P605 specific features of this tablet as there are already a ton of reviews for the Galaxy Note 10.1 (2014 Edition). Although most are the Wi-Fi only version, which is model SM-P600. This version we have here is the international LTE version, SM-P605. Unfortunately these international versions rarely support the US LTE bands, so we're stuck with 3G/4G (i.e. 1900 MHz) here in the US.
The P605 also has a Snapdragon 800 instead of the Samsung Exynos processor. I'll go into more details below. Otherwise in addition to the data & phone capabilities of the P605, they are virtually identical. Or a another comparison might be that this is basically a really big Galaxy Note 3 with a USB 2.0 port and higher resolution.
With T-Mobile in my area (Austin, TX) I'm in a "re-farmed" area. In other words, they've taken some 1900 2G spectrum and re-purposed it for 4G connectivity. If you have AT&T, they already use 1900 so you're good to go. But it is nice to be able to have multiple carrier choices, when possible. I do get a strong signal in my area, although I'm only seeing about 2.5MB to 5MB down with H+. This is likely due to limited bands and network limitations. T-Mobile likes to use the 1700 and 2100 bands (AWS) together for 4G, which this tablet doesn't have. My Galaxy Note 3 phone on T-Mobile 4G/LTE can easily see 20+ down and 15+ on HSPA+.
I'm hoping future network improvements will help those speeds, otherwise it's more than enough for surfing, Skype calls, or even streaming High Quality YouTube videos.
Yes, the P605 has an actual phone modem built-in to just like my Galaxy Note 3 does. I popped in my T-Mobile pre-paid SIM that gives me 100 minutes, unlimited text, and 5GB of data ($30/mo) and it works great. I can make phone calls and still have access to a ton of data. Why make phone calls on a tablet? Because it's awesome, that's why. :)
Seriously though, while making tablet phone calls isn't something I do all that often (i.e. rarely), it is nice having Google Voice forward calls to multiple devices and being able to answer when and wherever I want. It's all about flexibility and having options.
I've owned the SM-P600 (Wi-Fi Only) and now the SM-P605. I really wasn't a big fan of the performance in the P600/Exynos. I frequently found lag and stutter throughout it's usage. The UI worked OK, but switching apps and multi-tasking was a bit annoying. Once I moved over the P605 I found everything to run much smoother. Now that is not to say it's all 100% perfect. There is still an occasional stutter here and there, usually app related, which shouldn't even be an issue with a $600 tablet... but it's far more livable.
For most usage such as switching apps, playing video, multi-tasking, navigation the UI, games, surfing, all work about as well as they do on my Galaxy Note 3; maybe just not *quite* as smooth at times when certain apps get in the way. Keep in mind this tablet is pushing a lot more pixels than my phone. And I'm personally very sensitive to frame rates and such. Although I'm hopeful future updates will continue to improve in this regard.
Let's wrap this up with my overall Pro's & Con's, even though I didn't touch on most of this stuff due to many other reviews already covering it.
* Noticeable performance improvement with Snapdragon 800
* Built-in Phone Modem (Accepts normal Phone SIM)
* Supports 1900 Mhz Band for US 3G/4G Data
* Excellent 2560x1600 (WQXGA) LCD
* Solid high-end specs
* Light weight and portable (~1.2lb)
* Finally a tablet good enough to keep
* Descent sounding speakers (for a tablet)
* Great battery life, even on 3G/4G
* MicroSD Card Slot
* Textured back feels nice to hold
* Would like to see further performance improvements
* No US LTE Band Support (or AWS)
* No USB 3.0 Port
* Fixed home/navigation buttons can be annoying
* Plastic bezel looks cheap
* TouchWiz still too heavy (resource hog)
I returned the SM-P600 after about a week of usage before I even got the SM-P605. I had almost given up on Samsung tablets, but I'm glad I kept looking! The tablet has handled everything I've reasonably asked of it and even gives me added flexibility of basically having both a smaller and larger portable voice and data communication device. It'll do. :)