When you have pixel perfect buttons (or items in general) and attach a UIButtonOffset, all the gfx go a bit blurry.
I've tinkered with the tween code and basically put an Int modifer on the vector before setting it.
eg
Vector = new Vector3( (int)Vector.transform.Local.Position.x, (int)Vector.transform.Local.Position.y, (int)Vector.transform.Local.Position.z);
Perhaps there should be a option, so float values or int values are used in the tween.
PixelPerfect Move []
For certain, the smoothness is ever so slightly jerky, but now the gfx don't go blurry. Same goes for UIButtonScale.