I leave the house around 8am with 100%, with 'light' use during the day (2-3 calls, 4-5 texts, a few mins surfing, a few pics) and get home with about 80% on LTE (approx 4pm). Its used more heavily after that, and I have about 20-30% by about 11pm.
I would say its a little better than stock, but barely noticeable for me (but worth it).