I have bought a lot of Panos plug-ins and have found them to be professionally set-up and genuinely useful as part of my commercial workflow. Like all pug-ins you have to choose the appropriate time to use them, but I have applied them to technical projects on a number of occasions with good effect. Clients are always impressed with the results.
On the occasions that I have contacted the developer he has been courteous and helpful - he is just as happy to hear if you think you might have discovered a glitch or help if you are having a specific problem. Response is always professional.
As a very long-time photoshop user (24 years) I appreciate the amount of work that must go in to developing these photoshop plug-ins. It is a testament to the quality of Panos plug-ins that I just bought it straight away! Results are impressive.