Schweser vs. CFAI Questions

Greetings,

I have pretty much used Schweser materials exclusively for my Level I prep. My question for those in the know is: are the Concept Checkers and Q-Bank questions of a comparable difficulty to the actual exam? I am pretty deep into my prep and am wondering if I should be mixing it up with CFAI questions. From what I hear, Schweser practice exams are as difficult if not more difficult than the actual exam and I'd like to know if that holds true to the Concept Checkers and Q-Bank as well.

Please share your input and past experiences.

Thanks,

John