Originally Posted by jsconiers
There are LTE tablets on ebay. According to comments these tablets cannot do LTE on AT&T's network but they can do GSM. Is that correct?
Yes. Both the P601 and P605 are quad band GSM and will deliver HSPA+ data speeds on AT&T's network (5-10MB down) and perhaps as high as 20MB down on T-Mobile because they're dual-channel HSPA which both N10.1-14's support. Any quad band GSM device will only work on T-Mobile in markets they've re-farmed to 1900MHz. Even then, being so high on the frequency band, indoor coverage can be poor and even outdoor reception can be spotty. If you're planning on using T-Mobile I'd ask people in a T-Mobile forum what kind of coverage they are getting where you'll be using your device. To use the dialer and MMS you'll need to put your device on a "smartphone" plan. "Tablet" plans don't support voice or messaging. Since you're "bringing your own," if you're on a Family Share plan with AT&T, it's only $15 a month now.
Here are my results on AT&T with a P-601. I've gotten both higher and lower depending on the market I've used it in.
Also, they have a different processor for the wines with LTE. Do these tablets still perform well with the different CPU? Is it that big of a difference?
No. Exynos is stronger in some benchmarks while S-800's stronger in others. Even then, where there's a difference, it's minimal and at such high performance levels for both chips you won't see the difference. Read the N3 forum to see people with both devices thoughts. The same comments would apply to the N10.1-14 because it's equipped with the same CPU/GPU options. The biggest difference is charging time. A full charge on the P-601 takes 7 hours and 5 on the S-800 version because of Qualcomm's QuickCharge feature.
Is there a 64GB version of the 2014 edition.
No, at least not one that's currently purchasable.
Are the mods / kernels worth using or should you stay stock?
Scott Rossler has done a CleanROM for the Wi-Fi N10.1-14 which you should be familiar with from the Asus forums. I don't know if he's adapted it (or will) for the P-601/5. There's far less development for the 3/4G versions because there are far fewer sold.