Fair > bucket
(they may not always be in hit stun though)
One trick is to use it ASAP from getting it, this way the opponent hasn't possibly planned much to avoid it.
You can see this at the start of my 1st montage-
http://youtu.be/p8Br1GoYprE
A second way to use it is seen in the second clip in the montage.
if you predict their roll kinda thing. It also helps that Game and Watch's roll is faster than other characters such as Robin which helps if you want to 'shadow/stalk' their roll with your roll.
Jab 1 > bucket
you can do some gimmicks with the jab 1.