Rohypnol is like any other benzo really.. it's not the most powerfull, not the most long lasting, but it is ILLEGAL and NOT SOLD IN THE US, thus making it more popular then any other benzo...
Klonopin is very close in effects, and about half as strong - a 2mg Klonopin and a 1mg Rohypnol are almost identical in effects..
So if you have played with Valium or Klonopin, this wont be much differn't.. there are a TON of counterfeits out there - the good news is that some contin high amounts of other benzos, so it's not a total bust!
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PACK.MY.BEAK