Remember, only works on new items, not existing sales items. Those are already marked down + you get the 20-50-150 discount. The bizrate would be the third discount.
At any rate, it worked for me. I had to place two separate orders to get maximum value of the 20-50-150 deal, but final savings were close to 40%.
Code worked great, thanks. I got the -50 deal plus code and free shipping for a nice savings on some of the new indigo dyed tees. The black indigo tee looks especially nice.