Initial configuration a little difficult.
The online manual comes in handy, for cons there are some errors that have crept (eg alt-click has been replaced by a ctrl-click on a page).
Getting started very fast and intuitive, has a comparable Live.
Not enough surfaces recognized twelve o'clock, everything must be done by hand (simple to do, but a long time one or more of music software configurations have pre-registered for the most common controllers).
The software is fairly stable, the quality of its faithful via ReWire (unlike Live 7 that does not respect the source).
Some instabilities starting / leaving projects using Reason via ReWire.
Not having a configuration that uses heavy-handed I can not judge its performance.
Everything is configurable. All. Provided the effects are extremely powerful to the point where they can become difficult to use, and suddenly you can discover some of their options by going to dig into the manuals, to realize they are even more powerful than the initial notice did not think.
The value for money is excellent, with a special license to use an amateur reduced price: $ 50, and a license "if you earn money with your music" was $ 225.
After trying to order a sluggish Live and finds that it was unfortunate the sound reproduction, fast Cubase and Sonar (no grip on the interfaces), I finally found a program that is both easy to use, efficient and having a clean record.