I have recently started the Oxford course and my biggest distraction is the quality of the notes.
My day job involves publishing technical journals and books and it is quite off putting having to read stuff which has typographical errors, basic errors of grammar and seemingly random comments appearing in the text. A chapter which might take an hour to read is taking me longer as I correct the text.
Many people will not care and maybe even not know that the grammar is wrong as is evidenced on this forum by the abuse of the apostrophe S, or the random use of commas.
The material comes across as someone's typed up lecture notes as opposed to a text book.
I have not seen the notes from any other training provider so I cannot comment on which is better.