So I keep seeing 4GB new xbox slims cheap and thought it might be time to buy a few. I've noticed on sites that sell xkey that they warn they can't be used with certain drives/mrf dates. With usb pro v2 and probe 3, can I just buy any new 4GB slim and use xkey on it? I know you've told me before Dinohscene, but I'm so confused I've done it with usb pro v2 and Probe 3 on one slim and successfully installed xkey (the MW3 edition slim).