The reception is good. But everyone has a unique situation thats all their own because theres so many variables that can affect it. Data is also going to be affected by signal but doing a speed test while having full bars i was pulling 25mb down and 12 up. People have reported much higher tho. Here in idaho verizon has the best coverage hands down tho. As for lag .... no. People that have lag on their s4 are doing something wrong. I have streamed music while downloading torrents while playing games and the phone doesnt even stutter and this is on a stock rom. You can expect even more speed out of a custom rom.
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