I would never choose this legacy. But someone asked me why I wouldn't and I didn't have a better answer then this....
1. If your capped on crit it won't have any effect as it won't go over cap. Is this correct or did I just pull it out of my hat?
2. Its off-hand crits only which as a whole doesn't give that much of an effect on over all dps so your better off choosing something else. Correct?
I then got the question... well will it not help to keep the crit chain open if nothing else?
I answered: Your crit chain will be open pretty much all the time anyway, you will find that you'll be waiting on chain skill cds not crits to open the chain.
But is there an other reason that I've missed that makes this an obviously &&&&e legacy or is there actually a use for it?