I can say for a fact that zooming on the grid would have been a better experience. As-is it is currently only usable if I use my phone as landscape rather than portrait as there is no space between each item. For most sites I don't bother rotating my phone - scrolling down is worse than zooming in/out. Especially when trying to read a grid or chart reliant on seeing all the information at once and not 4 rows at a time.