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[dutchman]

Provider: Straighterline
Course: General Chemistry I
Course content: The course material is presented in an eTextbook. Otherwise, if you need a break from staring at a screen (like I did), you can purchase the textbook from online sources. The course consists of six-chapter tests and a final, which are all timed. You can retake the first exam as many times as needed up to the point of taking the final exam which is proctored. Considering the amount and detail of the material covered, I was somewhat surprised by the focus on doing calculations throughout the course, both in study and in testing.  
Final exam format: The final exam was multiple choice and 60 questions. 
Final exam content vs course content/practice exams: The reading and practice material did a decent job at preparing you for the tests.
Time taken on course: Collectively this course took ~ three or four weeks. I did all the reading ahead of time and then I did the actual course (referencing back to the reading material as needed). The majority of my study time was spent practicing how to use the formulas and doing calculations and conversions.   
Familiarity with subject before course: I was familiar with several topics before picking up this textbook. When it comes time to tackle atomic orbitals, subshells, hybridization etc. (chapter 9), I thought Khan Academy did a decent job of providing some clarity for me on these particular topics.  
1-10 Difficulty level: Difficulty was about a 5 because of all the calculations.

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Provider: Straighterline          
Course: General Chemistry I Lab
Course content: This course consisted of 8 labs and 8 graded lab exams. Nearly all of what you need to know for the questions on the labs and exams is covered in materials provided under each chapter. The course is straight-forward. Yes, you are required to buy the lab kit.  
Time taken on course: This course took ~ two days.
Familiarity with subject before course: I was very familiar with the material as I had recently read the General Chemistry I course textbook. However, it is certainly possible to pass this course without taking General Chemistry I.
Pitfalls, high points, things others should know: Some directions and references in the lab guide did not quite match the lab worksheet, and vice versa. I recommend that you read both the lab guide and lab worksheet fully before starting each lab. 
1-10 Difficulty level: Difficulty was 1.