From what I've seen/understood, most criminology programs won't admit you directly to a Ph.D. program without an M.A./M.S. I do like the potential for a break between a masters/doctoral program, though. I don't foresee myself wanting to take one, but it is less daunting than the prospect of immediately entering a Ph.D. program.
I've only heard back from University of Pennsylvania, American and University of South Florida. One of those has offered me direct admission to their Ph.D. program, and another school I applied to and haven't heard back from told me they would rather I apply directly to their Ph.D. program. But I'll probably be doing a Master's program first, due to differences in school caliber.
I plan on continuing on and getting my Ph.D. after I complete my Masters.