I think mine is great. Not a problem with the top hook fixed (for me). I have modified some 3pt attachments to fit, not because the top hook was in the wrong position, but because the attachment didn't have the room or space for the top hook to slide into position. The top hook is also perfect for pulling and lifting things with a chain (i.e. towing the UPS truck out of the ditch), or dropping the logging tongs over to pull logs out of the woods.
I would find adjusting the top hook to be more inconvenience than I want to have when using a quick tach. But I don't want to disparage anyone who likes theirs "adjustable" that way.
I have found the I-match (and there are others that are similar) to be one of the handiest attachments that I have. Wouldn't have it any other way. Other thing I like, it is GREEN.