Not what you asked, I know, but a perspective for you - While I have not used that particular scope (Crossfire) - I am absolutely sold on Vortex as a company and have some of their other products. Customer Service is absolutely second to none; unlike others, they treat individual consumers extremely well and have a transferable lifetime warranty on all of their stuff (even their cheap lines like Crossfire). They pay attention to what people say, think and want, and are all over the internet forums staying engaged with the firearms community. If it were my money, I'd buy the Vortex without question; I am that impressed with them as a company.
Not had any experience with Pentax, I am sure they are fine and have been around a long time.