It's more brittle, so if not looked after is likely to crack up quicker, it's also denser so will give you a heavier bat over a sapwood opponent, however if treated properly it looks after you as well as you look after it, the ball tends to fly off of heartwood a bit more and gives a lovely cracking sound when you hit the ball
Just splitting hairs here , but.....would a 50/50 two tone bat be ever so slightly lopsided , in terms of weight , if both sides were shaped to the same dimensions ? ( given that heartwood is denser / slightly heavier ).
It used to be the very popular but dropped out of favour as white wood sapwood became the willow to be seen with. Also a thin strip of heartwood on the top edge of your bat can help prevent damage caused by edgeing the ball and for many it means there's no need for edge tape.
Really? I thought it would be more likely to crack as it's naturally more brittle than sapwood? It's a preference thing but I prefer my heartwood (no more than 1/3rd of the blade) on the inside edge of the bat as that's where I tend to hit it most (I could also save weight by cutting a hole in the middle...)
As stated earlier this is a trend that comes in and out of fashion. When we first started to see pro's using two toned willow as we called it back then we all wanted one. I've had excellent bats with plenty of heartwood and some others that were pure crud. It's all down to personal taste. I think there is some evidence to suggest performance is a more immediate with a two toned bat but durability is compromised a little. It's a good enough reason to have a bat in your collection with heartwood...just to experiment