So about a week and a half ago I finally rooted my Nexus 4. Yes I know, I have the most easily rootable phone, and am a well known advocate of rooting, why the did it take me 5 months to root my phone. The answer to that is that there hasn't really been a reason to root my phone. The nex4 is fast, the battery life is more than adequate, and I haven't had any issues. So the main reason I rooted was because Tmobile turned LTE on in San Antonio. Don't get me wrong, Tmobile's HSPA+ is plenty fast, speedwise, but the latency leaves a little to be desired. Latency is an area where LTE excels.
The best latency reading I have ever gotten with H+ was 44ms, I usually average about 250 or so. With LTE, I average about 30 ms. Speedwise, (once again, this isn't a huge deal to me) I would average 8Mbps on HSPA+ and with no bars on LTE, I average 9. In a full bar area I top out around 25. 8 is plenty for me, but more isn't worse. LOL.
Not to shabby for a supposedly not LTE ready phone.