alt tab doesnt place your windows into stealth mode.. doesnt lock the computer automatically, doesnt bring up other applications in a pre-set manner.
dont know if it justifys spending 25 bucks, can just program a macro-express to do it for you.. but then you can't use your foot

The windows button + spacebar locks it and yeah writing a script to do all that stuff with any shortcut you want isn't that hard

I'll keep my money to pay my monthly driving taxes, kthanx.