NA wiki reports the slow % on sea daughter to be 13.3% which really isn't that bad!! XD But the staff gives 10 tp per hit w/o any store tp. If these conditions remain the same, then letting the TP regain on sea daughter provide you with TP will beat out the TP you could gain while melee'ing without buffs. Lets say Sea daughter in 65 seconds gives you 108 and 1/3 tp, while meleeing will give you 100 tp.
You can also melee despite this slow effect, haste yourself and what not, and you basically double your rate of tp.
We could play with the numbers and crunch multiple gear sets and situations. Though all I want to say is that the slow on sea daughter shouldn't be a turn off for the extra benefits it provides :D
