It's false. Unless something has changed in the last year and half, my old tests disproved this:
http://www.bluegartr.com/forum/showt...ht=haste+samba
Specifically:
As was tested other times, Hasso + 5 Desperate Blows merits caps at around 25% JA Haste. (It would be 35% if there was no cap.) If Haste Samba went above this cap there would be a large and significant improvement, which test proves there is not. In fact I should have seen 39.65% haste, but only showed 38.87% haste, which leads me to believe that JA haste might actualli cap at 250/1024, instead of 256/1024, which would fit much better~