Even though I left FIITJEE during my 11th grade, I studied there for 4 years so I believe I am qualified to write this answer.

The faculty member are brilliant: Most of my sirs at FIITJEE were not only brilliant at their respective subjects but also kind, and they related very well with students

They accommodate everybody: They had accelerated batches for the smart kids, and they had special times for doubt clearing if you had any problems.

Even though I haven't experience any other JEE coaching, I would like to say that the FIITJEE experience was brilliant, and I had a good time there while learning more than I could’ve hoped to without them