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

I have written a post in my Blog about Ria WCF Data Services, and WCF Rest Service using also some of the conclusions reached here it is here.