I am itching for one or the other but the price difference led to do some research in the differences (if any) between these two camcorders. The Panasonic support site doesn't have the operating manual for either one. Here is good review of the AG-HSC1U. It does allude to the HDC-SD1 to say that this "Pro" version isn't really worth twice the money but it doesn't compare it to the HDC-SD5 though. Could anyone comment about the differences feature-wise please? What makes the AG-HSC1U a "pro" camera? Also, the alternative is the HDR-CX7. It does not, however record in full HD, 1 CCD as opposed to 3 here on these Panasonics, has no manual focus/ gain and it uses the Sony Memory Sticks.