I want to acknowledge SoundTower's customer support. I was an early purchaser (probably Ver 1 or 2). I lost my computer and all of my records of my purchase in a burglary. When I contacted them about six or eight months ago they found a record of my purchase from 2004/2005 and issued me a new license for the current version. The license allows me to run the editor on OSX or Win7 (bootcamped) without a hitch.
If my experience is typical then I'd say it is worth the investment.