Early feedback on U.K./Canadian BlackBerry Q10 (BBRY -4%) sales indicate volumes below expectations, says Cleveland Research. The firm also thinks Z10 sell-thru is likely half of what it was around launch time, and believes BB10 build targets for the next few quarters could fall to 6M-8M from 10M-12M. Likewise, Pac Crest remains bearish, and calls the U.K./Canadian Q10 launches a "mess." The remarks follow a pessimistic note about BB10 sales on Monday from Canaccord, and one on April 25 from Wedge Partners. Jefferies has been more positive.