Oh man, get some beef and smoke it with those 100% Mesquite pellets!!! You will be in heaven.
Most brands seem to do a blend. The PBCB Is something like 50-60 Maple, then equal parts of Cherry and Hickory according to some hardcore google research I did in the past.
Most brands have a "flavor" like Hickory but that is usually no more than 25-35% Hickory and then it is blended with a less expensive regional wood like Oak or Alder.
Lumberjack is one of the brands that will tell you 100% of the wood or will tell you that it is a blend right on the bag. I'm a huge fan of Lumberjack pellets and make my own blends using a variety of different 100% wood pellets.
As for 100% Cherry, it can be harder to keep lit than other pellets. I have found that the microwave trick (microwave 1 minute, wait 2 minute and mix, then microwave another 1 minute) helps pellets burn more easily even the cherry pellets. Also having a good draft helps with the cherry pellets so smoking 225F or higher seems to be a good draft to keep air flowing through them. I just had problems at 170F with them for Jerky but I have a solution for that.
You shouldn't have as many issues with other types of wood. The 100% cherry on my venison jerky was good, I just need to increase my draft to keep the 100% cherry going at 170F, and I have that solution already :)