Goodbye Mirko, you frustrated us at points, but when you had a good game, you were magical. He will be missed, but as said I think overall the deal (if its a straight swap) is of more benefit to us.
If both (hypothetically) left for the same price, and we were going to use the money on a class striker, it would make more sense to sell Mirko, as to sell Lichtsteiner we would need to invest part of the money in a new RB/RWB