I will add my 2 cents to the costs. In most of my implementations, installing and testing SiteEdit 2009 usually took less than half a day on Wednesday. Make sure you apply all the hot fixes from SDL Tridion World to make it work with the latest browsers.
The new user interface may additionally use something called Session Preview (to ensure quick publishing), which uses several content delivery technologies, such as OData. If you are not already using them in your implementation, then they are likely to be a significant investment in the infrastructure / design of the applications so that they are designed / installed / working / tested (I heard cases when it took more than a month), which will make Management experience significantly more costly to implement in the short term. If you donβt use the Session Preview feature (as Frank already said), the lead times / costs are the same, but you wonβt be able to use the new features to quickly publish a new product.
As for functionality - both environments look and differ from each other. The work manager is clearly oriented in the direction of product promotion and provides a multi-layer interface. Therefore, if your client is not familiar with SDL Tridion, I would suggest using it, however, if they are a long-term SDL Tridion client who has experience with SiteEdit 1.3 or 2009, and you do not plan to use some of the new features in the short term Iβm tempted to stay with SE 2009 and go to the experience manager when they upgrade to SDL Tridion 2013.
Chris summers
source share