[Aerkuld]

1. Has anyone used/own this product? YES, me too
2. If so is it worth the money? Absolutely, it pretty much pays for itself the first time you use it. I used it to verify my faulty brake light switch and confirm the fix was a success.
3. Which one would you recommend, enthusiast/professional kit? If you plan on owning several Porsches in the next few years, or know several people who would want to use it (and you're prepared to offer it on loan!) then buy the pro kit. If you don't see yourself owning more than three cars in the next 5 or 10 years then buy the enthusiast version.
4. Easy to use/setup/user friendly? Very. If you can install a printer then you can do this too.
5. And where is the plug on a 2003, 996 cab to use it? As correctly mentioned above - on the bottom of the dash to the left of the steering column above your left knee.

I assure you you won't regret buying this. I am sure one trip to the dealer for a diagnostic check will probably cost the same as buying one of these. Combine that with the ability to clear certain fault codes and check things on the car like time spent in over-rev conditions is both money saving and interesting! Definitely a good buy.