Yes I am currently in my 5th week of groundschool at OAT.
So far the instruction has been superb. There is a lot of work to do, both in class and in your own time. the groundschool takes 6 months to complete, unless you need to retake any exams.
Once I have finished the ground school, depending on results, I will be hour building before starting the CPL/ME with OAT, either in Oxford or in Phoenix.
Any other questions, let me know.