Blast Man is one of the strongest bosses in Mega Man 11. I fought him last on my campaign through the game. I'm glad I didn't try a bout against him first.
He's very fast and quick, and his attacks are hard to dodge and will take your health down easy.
Which gets worse when he powers up with a better move.
He's weak to the blazing torch power, which I used to finish him once my health got close to zero. I wasn't going to let him win.
After it's over, you get the chain blast costume.
Which allows you to have large blasts to your disposal. Didn't get a chance to use it much during the game (except Dr. Wily's castle) but it would have come in handy on some levels. Really came in handy during the final parts of the game.