Attacks against this insight are mostly
1. Pleasure is fleeting
and
2. There is bad Pleasure.
What defenses would you see ?
The defense of the 1. is that yes everything is fleeting, so life is fleeting ( even virtue ) but there are the more stable forms of Pleasure like Ataraxia/ tranquility.
For the 2. there Epicurus divides Pleasure and their bad consequences.
How defensable is that?
Bad Pleasures could be addictions or laziness, sadism, masochism.