When they finish the job, make sure they remove all of the tape and do a proper silicone seal on the inside.
I had trouble with a supplier not mentioned above where they said that they would leave it behind to protect the frame when I repaint but in hindsight I should have got tyem to remove it as it was an eyesore until I actually painted.
Also with sliding doors, the tape is difficult to fully remove as it is tucked behind where the doors overlap.
They should do a proper finish in my opinion!