Unfortunately their subscription service implementation has real issues (which is ironic considering their business) and their customer relations/service department is incompetent or indifferent. The quality of Packt books varies considerably: some are excellent; many are poor. If you subscribe to their service and run into problems, do *not* assume that the customer service department will resolve the issue. I let things drag on for months (with no access) before I finally deauthorized payment.Update: After much back-and-forth, Packt did finally address the issue and compensate me appropriately for the past lack of service.
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