It really depends what teacher you go to. Some are not good at explaining concepts even they are very smart and some are awesome and probably the best tutors you will find. There is already a forum on what teachers are good...
And yes it is on the expensive side. Deal with it:spin:;)
It's rly good for content based subjects such as phys and chem as it has extensive notes and good teachers. Although for maths especially 4u i wouldn't recommend it unless your actually pretty decent in maths... imo they go through maths rly quickly and don't try to teach you the basics or...