The concert 10 has a concert scale neck. Size wise, it is between a traditional concert and soprano body. But to me it feels more mike a concert, at that is how I perceive mine. It is both slightly more punchy than most concerts and has more base--kind of an amazing things he pulls off. A lovely uke. You mentioned Donaldson as well. Both are great, and both luthiers are great to deal with. Brad is a bit less expensive for his base models, but I think his prices are amazingly low. Pohaku are also great for the money, IMHO.