i dread having to explain that to players. Having to cross reference 2 from any of 9 different traits each time they want to spend xp including during character creation (thus making the task twice as long depending on how many players are rolling up characters simultaneously). This is the sort of thing that puts people off. Sure if you're a hardocre 40k fan you might give the system more of a free pass, but if you're new to this...
I played it with my group. All roleplayers, some more experienced than others, some played DH1E, some not. I explained the rules to them and there were exactly 0 problems with understanding the system. One of the ones who hadn't played DH before wanted to play a psyker and that too was no problem at all and he was fine with the system. We build our chars and played a short introductury adventure. Everything went fine, no problems with rules at all and everyone had a blast.
Spending xp was also not a problem, because we had 2 books and there is a supplement online which gives you the table.
From playtesting I can say that the system works fine as is.
Edited by madMAEXX