I,ve trained in nunchaku, bo and sai in the past and am currently practicing Bo. It is probably also my favourite weapon out of the three, as I find it easily relates to Karate stances/techniques and is good for conditioning. Nunchaku would be my next on the list as its a very dynamic weapon due to the connecting cord. I hope to return to Nunchaku training next year, we have regular kobudo classes at our club, but as they,re on a Sunday and I train Karate on a Saturday its sometimes hard to make it, and still fit in family time.
I have a Bo grading in December and have to perform Taekyoku Shodan No Bo, a Bo kata created by my Sensei as a "Shotokan" type Bo Kata. I,ve never taken part in any weapons competitions but was part of a "demo" many years ago.
Sai has to be the most challenging of the weapons I,ve tried,quite fiddly,especially the "flicking" out from the palm techniques, but I haven,t given up the Idea of returning to give it another go.