I went through the program, and I actually now help tutor students in the program. For me, the FLEs were very similar to the MCAT. I felt like the Altius FLEs were harder than the actual MCAT, honestly. I had a big jump in my score between my last Altius FLE and my test day, but they are working to make sure the scoring is more reflective of what you will get on test day. I'd recommend the course or the FLEs - it honestly worked wonders for me, that's why I am sticking around to tutor.
Did Altius 10-pack practice exams, C/P and B felt pretty similar. P/S on the real deal had more reading comprehension and less data interp than Altius. CARS felt a little different; no one matches the real deal as closely as the 2 official sample tests.