Before I try to do some commentary on the sound of the Mainland slotted headstock concert and Collings UC-1, I'll show a comparison video I made playing Going to California using the two ukes. The video is made by cutting and pasting several short videos of each segment of the song. I alternated the two ukes pretty evenly. Both ukes are strung with Worth CD strings. Take a look to see what you hear from the video. I will write more about the sound in a later post, as well as provide more sound samples.