Personally, I've never had any problems manipulating this pedal to my liking as it is pretty basic in make up. Like all Boss pedals it has four different knobs, with this one having parameterrs for effect level, feedback, delay time, and a mode knob that allows you to choose between a number of different types of delay including modulate, analog, reverse, and four different amounts milliseconds. The pedal also allows you to tap the tempo if you hold down the pedal and then stomp out whatever tempo you want it to be at. I can't imagine too many people having much trouble with this pedal, and for this reason I don't think having the manual is necessary.
Just about every sound heard from the Boss DD-7 Digital Delay is awesome. Each has a super clean tone quality and the pedal is a pretty versatile one with all of the different modes. My favorite modes are the reverse and modulate ones, but the others are really just as good and this is just a matter of personal preference. While I like all of the Boss delay pedals in the DD line, the DD-7 probably has the cleanest sound quality and most versatility. I really have no complaints about this pedal and unless you are looking for a true analog delay pedal, the DD-7 can service all of your delay needs.
I've been using the Boss DD-7 Digital Delay for about a year and I have come to the conclusion that it is definitely better than most of the other digital delay pedals out there. The price isn't all that expensive when you consider what you are getting, which is an extremely versatile delay pedal with a great tone quality. If you are looking for a delay pedal, the DD-7 is one that must be discussed and tried out.