As you probably know, the head tube and seat tube angles will slacken. This will also cause your fork trail to increase. My guess is that the change in trail will be more noticeable than the change in angles when riding. The steering will be slower or more stable depending on how you look at it. Will it be truly noticeable? I don't know. Maybe somebody else can provide the actual amount of change in numbers and an opinion about what you will feel.