Straighterline Math courses - what are they like?

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Hello everyone,
For those of you who have used Straighterline to complete any math courses on there, could you tell me what your experience was like?  How was the Straighterline platform - user-friendly or not as good as study.com?  Also, could you explain how he unit tests are compared to the final exam - timed, not timed, etc.  What was your prior math knowledge before taking the course and was it easier or harder than you would have thought?

Thank you all!