Never tried it. We cant discuss legal stuff here, so putting that aside for the moment, it is chemically identical to cocaine save for a fluorine atom in the 4 position of the benzene ring instead of a hydrogen. Im not a chemistry buff by any means, but istm the best way of making this stuff would be fluorination of cocaine, and therein lies the rub: your starting material is illegal, and fluorine is toxic as hell... why even make it unless there are significant gains in strength (thus reducing bulk), while retaining all of cocaine's effects? or reducing side effects?
In the unlikely event I'll ever try this, I wont be mixing it with alcohol, or anything else, unless I take too much or have a bad trip... riding it out is probably safer than using another drug to 'undo' or 'reverse' its effects. I suppose I'd have more interest in this substance if I liked coke...