What a clever boy! I would say go for it. My 2 (boys) have been completely different when it comes to potty training - the first was like yours, very keen and showing signs of knowing when he was going to go, so we started potty training early and slowly, with no pressure. He was 21 months when we started, and was in pants full time at 22 months ish.
Number 2 boy is a different story- he is 28 months and loves being in pants and using the potty, but rarely asks to go and isn't fussed if he does have an accident..he's too laidback to care I think.
Good luck if you do decide to go for it - think of the money saved in nappies if it works!