Pros
Guitar Center Professional draws upon the market of the retail, brick and mortar store with over 250-locations nationwide allowing for the possibility to have a large network capable of reaching the masses. They have access to a vast array of product lines, many products that would never be seen in an actual Guitar Center store otherwise. Due to bulk buying power the ability to offer competitive costs and pricing to the consumer is of huge advantage to those solely looking to purchase based upon price.
Cons
Originally founded as GC PRO to appeal to the professional user(s), Guitar Center Professional apparently is now considered a service on the same level as Rentals, Repairs, and Lessons (just look at the website for confirmation). The compensation plan is far from what an experienced professional should earn and when that compensation can't be met, it's impossible to keep professional experience which becomes a grave disservice to the customer in the end. There is very little organization, getting even the most simple things accomplished can be significant amounts of effort.