I'm pretty happy with my NKP 759. I'm not absolutely sure, but it seems that the whistle sounds better than what I heard after listening to the first batch of Berkshires. My new Berk is my first Flyerchief locomotive, so my comparison is from memory of what I've heard of other examples running on other layouts and at shows. I may just be imagining the difference, but I'm satisfied with the sound.
Has anyone else noticed a difference in the latest batch of Berkshire whistles, or is it just me?