I'll jump right in on this as I just got a shipment from Mark.
General Selection - Great, I always just email him if there is something I am looking for.
Hard to Find / Limited Edition Selection - store exclusive Cohetes, which I have purchased.
Ordering Process - never used the website, I just email him, tell him what I am looking for, and he emails me a price.
Quickness of Shipment - same or next day at latest
Customer Service - the best, works with me, has held out stuff for me, ships fast, always goes above and beyond in the shipment.
Packaging - packed nicely, never any damage
Humidification Level upon Receipt - fine, sent with small Boveda on loose shipments.
Mark has become a go-to retailer for me, glad that I can be the first to reveiw him. Great guy!