It's good in close range and taijutsu only matches since it requires physical contact with the opponent and causes high amounts of pain to him. It can be bad however, if you are unable to grab your opponent in the first place, so it's pretty useless in any other ranges, since he can just use ninjutsu on you, if you're attempting to reach close range of him to initiate this jutsu. Another disadvantage is, that both of your hands will be in use, leaving them vulnerable.
Uhh, dunno about the combos. o-o