The JHS legends of fuzz range was designed to bring the unobtainium of pedals to everyone, classic rare fuzz circuits. Most of us won't every have the chance to try the original pedals such as the super fuzz's and tone benders of the world let alone own them.
The JHS Crimson is a recreation of a pedal so rare even Tonepedia doesn't have one (Yet!!!!) These often sell for in excess of $500 so the JHS option is a great way of getting those tones without spending every waking moment online trying to find one.
As with most JHS takes on others pedal this has some extra features, the mode switch pushes the mids which is great for lead tones. The other advantage here of course is the build quality and overall reliability, lets face it the original is approaching 30 years old.
The question you will have is how close is the Crimson to the original ... Well you came to the right place! It's not for us to tell you, we have a newer EXH Russian Big Muff on Tonepedia along with a whole bunch of other replicas & vintage muffs so A/B them here yourself and tell us what you think!