Both Black Crusade and Deathwatch recommend 500xp per 4 hours of play (so they have the same baseline for XP rewards so should have similar advancement speeds), however Black Crusade characters advance far more quickly than Deathwatch characters.
A Librarian in particular needs to spend 1/4 of their lifetime XP rewards just to get Psy Rating 10. A Black Crusade character spends half as much (at most and may spend as little as 1/4 the spend of a Librarian). Then if you look at the powers, the Deathwatch powers cost twice to four times as much.
This difference in progression speeds is felt through out Deathwatch and kinda sucks in that players need to go through multiple sessions to see a marginal improvement. Have others come across this at all? Would be keen to hear from people who have been running Deathwatch for longer (only done 1 session, though I have been running Dark Heresy for a couple of years - very fast progression in Dark Heresy - don't even get me started on the differences there!).