There is not much wrong with that and no reason it can't work well.
As long as you get your nutrition right and recover well.
only real criticism is that the lower days are lacking a little, leg extentions, hamstring curls, lunges, Romania dead lifts could be beneficial depending on your goals.
also what are your rep and set ranges for assistance work?
what are your goals? what's your training experience? Current lifts? Current condition? All these are pretty important to assess if the above is optimal.