Having not owned any other bushing dogs I can only comment on my own, he's strong, determined doesn't catch often, but if he does its usually the runners have cut off an exit and its hesitated and that's all he needs.
If its tight cover he will crawl in and if he see or smells something he crashes through, I mean I can see where he is in blackthorn as its shaking, with him being vocal the runners position themselves accordingly, that's what they wait for his signal.
He's about 16"tts and 13kg in weight, has been in the beating line and will go all day with no drop in enthusiasm.