Default [Q] Straight Talk or Other Prepaid

I would like to know if any user is currently using Straight Talk, currently I'm on AT&T unlimited Talk, Text, Data (65 talk,text)(30 unlm data) but they are taking 95 monthly from me.

I get around 10 to 45 MBps speeds with AT&T

I anyone have been using Straight Talk on a nexus 5 or iPhone 5 and is working good I would like to know and what are the average data speeds