My double strike is about 50% now and its great. The problem is when you do anything with attacking other players (when the double strike goes off), it shows the first attack and then the second 'attack' where it recalculates based on the strike you got. The issue is this is really slow when it happens with epic boss because it grays out the option to attack, raid or clicking the 'X' to close the page, when depending on device, you have to close the app to close the results page. A friend of mine in PR1, who has over 100% double strike is having a huge issue with this of how slow calling bosses are because of this.
Its not like this can't be fixed because in WD, this doesn't happen, it just gives you whatever strike activates. It would be awesome to port that same code to make this go faster and prevent re-logins.