Hello - I used Wiley for L1 and felt it was ok. I purchased the self-study package.
-Pros: The books they send along are great and the ability of the online study vs the books was nice as I could study at work without being too obvious. The study sections are logical and study sessions can be completed in an hour or less.
-Cons: Their material and sample questions did not seem as hard as the actual test. They have a question bank of only around 1k questions which in the course of daily study and long weekend studies can go pretty fast. Plus I noticed several issues/error with some of the questions in the question bank. That part frustrated me the most. Lastly, their formatting and content presentation is the nicest I have seen, but when it comes to simulating the testing formatting and conditions, it is off. The actual test looks quite archaic and navigating the Wiley content wasnt consistent with that.
Based on those issues above, I actually opted (about halfway through my L1 study) to purchase the UpperMark final review and Testbank. It was the best decision I made in my study, since it felt like a whole new level. The questions were harder/complex and much more refined (virtually no data quality issues or errors). Their Testbank, if I recall correctly, had approx. 1800 questions or more available, which were definitely more representative of the test. Lastly, the format in the Testbank is very similar to what you will experience on test day as far as the look and the navigation ability. I also used UpperMark for L2 and definitely felt prepared, so I will recommend them all day long to people deciding between the two.
Best of luck studying and on the test!