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About the only small difference I can see between the Blackfire and Platinum is that while Blackfire has instant cure times, with Platinum, it's best to let it cure 15-30 minutes. I usually give 15 minutes, and it wipes off easier and to a better gloss than anything I've ever used. It's not all that much time, and you could be working on some other area for the 15 or so minutes anyway.
Here's a great site specifically for the Platinum by the people who produce it:http://www.platinumcarcare.com
The owner is also a great person to talk to and can answer just about any question you'd have when it comes to car care. Good luck!
Here are some pics I took about a month later:http://community.webshots.com/album/44428004spMbul