Blackfire has several great attributes
1. Very easy to apply and buff off.
2. Fast curing times.
3. Great looking results, rivaling klasse or zaino.
However the downsides are,
1. Loss of shine and slickness after one wash.
2. Since new product, no real experience on durabilty.
I personally enjoy working with bf, but the question of durability will have to be found out with experience. Alot of us are using bf so i'm sure we'll keep posting on here on our experiences.
I chose to use blackfire just to try something different. This spring i'm going to be experimenting on using blackfire and klasse together.
Good luck to your friend.