I've done it, I don't notice any improvements. But thats maybe because of the huge speed improvement.
But it's still handy for some other tweas/settings
Current: Sony Xperia Z (16GB+16GB), HTC One X, Samsung Galaxy Tab 7.7 GT-P6810 (16GB+64GB)
Previously: Samsung Omnia i900 (8GB+8GB), Sony Ericsson Xperia X1 (16GB), HTC Touch HD (8GB), HTC HD2 (16GB), Dell Streak 5 (16GB), Samsung Galaxy S GT-I9000 (8GB+16GB), Samsung Galaxy S2 GT-I9100 (16GB+16GB)