pros: faster, better duty limitations and smart groups. excellent support.
cons: expensive, data not interchangeable between the 5 and 6 version. impossible to purchase older version or to revert back to old version. no Icloud feature yet.
Overall it's a great costly product worthwhile the investment but I'm personally missing the freedom of choice. I'd only update one of the versions I'm always working on the rest I'd leave as it is. Indirectly the customer is pushed to buy all new versions. Not very fair but brilliant marketing strategy.
