Switched our plan last month to one with SmartBrowsing. Ran out of regular data 3 days before the end of the month and SmartBrowsing kicked in right away. Actually I never even saw any difference in the speed of surfing the internet on our desktop, laptop, or Kindle Fire. The transition was seamless. The only thing I noticed is that some pictures did not load quickly or only loaded halfway before I went to another page. But other than that, it was great!