This is an excellent set for the money and little needs to be said about Blind Lemon Jefferson if you are a fan of the Blues, but this set is probably best regarded as being aimed more at collectors than anyone else.
If you have ever listened to a 78 on original equipment, then that is exactly the sound you get here - surface noise and crackle is all part of the experience. BLJ's voice and the instruments tend to emerge from a sea of hiss on most of the tracks, which actually adds to the atmosphere in some ways - listening makes me want to sit on the front porch with a shot of Bourbon.
This CD is a time machine back to the late '20s; just don't buy it expecting an audiophile experience, because the sound reproduction is best described as "recessed". Given how old these recordings are and the way they were recorded, it is a miracle that they exist at all.