Store bought beer brew kits

Saw those "brew your own beer at home" kits not too long ago. Kind were its just 'dump this container, sugar and water into a bucket and wait'. I have been making my own mead for a while now so I have equipment and fermenting experience. Got a couple questions for those who have tried the beer packs.

1.how did it go? 2.how did it taste? 3.is it okay to add fruit or botanicals to flavour it? 4.any thing else to mention or recommend?