Depends. Everyone has a different learning style, whether that be self-studying or tutoring, self-learning, or having others set a pace for you, learning ahead, aural, visual, kinetic etc. Matrix basically has this system where in Maths (not sure about other subjects) they give you two booklets. On is theory and the questions within it is meant to be completed in class, the other is a homework book with "worked solutions" online in the matrix website (this wasn't working during my stay so idk how good it is).
I tutored with Matrix for about 2 terms in year 11. My teacher was awesome, but apparently another teacher also teaching year 11 ext maths wasn't that good. So your learning experience with Matrix - and I'd imagine with many other tutoring colleges, may vary depending on which educator you get. For me, my experience with matrix was dampened by the disorganisation the company was experiencing during my stay. I also found the content quite boring, and the homework became tedious (Some questions seemed impossible because of the convoluted theory expressed in the theory booklet). The lessons I took were 3 hours in length with one break in between. If you have a short attention span matrix may not be the best tutoring college. Some classrooms in matrix are arranged horribly in that some of the seating arrangements in certain classrooms, particularly on the sides, become hard to see the board with.The boards in the classrooms I've been, are basically one whole wall. Some seats are too close to the whiteboard/screen, so if you get a teacher who does write across many boards, you won't see some information unless you move. This may become an issue in a full or almost full classroom where you can't move (at least not in one lesson).
Anyways, I left because I felt I wasn't learning much from Matrix with my short attention span, but I know several kids from my school who have tutored with matrix for a long time (like a year?). That said IMHO matrix is like this "mainstream" tutoring centre which you go to because of how well known they are. Ideally you want to go to a smaller less known tutoring college which suits your tastes as an individual. You could also consider private tutoring, there are several tutors who offer maths tutoring for around the same price as matrix offers group tutoring for (around 40$).