I ordered the Lyngdorf mp-60 2.1
After convercing with the Acurus sales rep about the ACT 4 vs the Lyngdorf he stated that the Lyngdorf was not hardware and software upgradeable, which is false (Lyngdorf contacted me and stated that their product is in fact both hardware and software upgradeable). That statement by the rep made my mind up, you should at least be truthful about the products and rely on the quality of your products to sell themselves.