From what I could gather - no. They offer lower data in certain countries, but so far the best data roaming I found is the vodafone UK one. If your in Eu its 2GBP/day for 25MB and rest of the world 5GBP for 25MB. they also have some tablet version with 8GBP for 100MB in EU and 25GBP for 100MB (daily)

Toggle is some 15p/MB in the "local" countries which comes out to be 3.75GBP for 25MB