I have A.M. Dale's, from Oxford, 1966 printing. From the preface:
The imaginary audience to whom this commentary is addressed includes both pupils and professional colleagues. Younger school children were excluded, since there already exist simplified versions of this play designed for them, but I hope the Sixth Form may find things in it to interest them. Perhaps undergraduates were most often in my mind,
I have this because I hoard Greek commentaries. I have not yet attempted this play, or any other for that matter.
It has just under 40 pages of introductory matter (the Tetralogy, the Legend, textual matters), then the play, and pp 51-130 hold the commentary, in a fairly small typeface.