>>.How do you know what the clients wants? (Please don't take offense.) Are your clients savvy on the differences between datasets and EF?

I ask them.

No. The ones who want datasets want them because that's how they do things now

I've never asked them how savvy they are - not generally a good sales technique :).

What do you mean by "savvy" regarding EF?

At a meeting of more than 200 people at a .NET user group meeting last month, when the speaker asked how many people were using EF, 2 hands went up.

There were lots of people who knew the buzz words, but few, if any, had a clue as to what it's like to develop with EF.

Asking if someone is "savvy" with EF is like asking if someone has a "lot of experience" with VS2010.. how much can they have?