i love gai-sensei ... not necessarily a main team ninja (tho i've been using him recently) but like neji great for SAs and ninja exams. i keep mine up and i've never regretted it -- chances are if i'm stuck on a fight, he's an answer. definitely squishy, even with his leech, so i try and keep a healer around when using him. combos pretty well. great for kyuubi too.