It is a piece of crap, i used to work at Subway and all it does is micowave the meat and uses the heat to toast the bread. Quiznos among others are the ones that actually toasts the whole sub. Thats why TurboChef is able to claim that it 'cooks' faster than your usual oven.
I have tried this a couple of times and here is what I did. Install DOS 7.10 from a different laptop, switched hard drive to other laptop and ran winnt.exe. Everything is fine to this point. However, when the system is done installing all of the XP files it tries to reboot and gives me an NTLDR is missing error.