X3 ND filters anyone used them?

Haven't any experience of these filters, but to work out which one you need think about what readings you are getting now, then add on three or six stops. Which one gets you to the range you want? Might be worth having a read of their guide - http://breakthrough.photography/2015-nd-buying-guide/. The image in my avatar was using a 10 stop in the middle of the day, and I was getting readings of well below one minute. A lot depends on what you want them for.

Edit: was doing some long exposures at Brighton earlier this year and during the day I was stacking a Big Stopper and Little Stopper -16 stops in total.
 
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