It would be nice if you could set as an option to hide fields like tax after the full amount.
Now customer sees 100 euro (this is final price already with taxes) and in second line he sees Taxes : 20 euro..
Also I think it would be good to have chance to remove SKU column and give more space for others. I don't think that customers are interested in SKU number that says nothing about products, price or whatever.
Hope you get the idea - more options to control checkout table