What are the pitfalls of using .NET RIA Services in Silverlight?

Question

Silverlight can use WCF, Web Services, REST based services, .NET RIA Services, but it seems like Silverlight and .NET RIA Services are preferred most.

I want to know if

Answer 1

Ria services and rest services offers a quite similar access to server side classes that often are entity framework classes(but not necessarely...as several programmers appears to belive). The main advantage of Ria Services is that they handles Validation by using Data Annotations on server-side classes and do it in a smart way: they automatically generate client side-classes with the same data-annotations and validate them by implementing automatically INotifyDataError on the client-side class. If one uses custom attributes and put the.shared.cs (or .vb) extension those attribute definitions are copied in the silverlight client and used in the client-side validation, otherwise they are used only to perform server-side validation......for more information pls see my blog post

here