I think there's this perception (for some people) that Canadians say eh all the time, that every sentence we say ends with with eh. That's not true. The key to a good eh is to have it flow into the sentence naturally. Don't force it in to try and sound Canadian, or to prove you like Canada. The only time I hear people constantly say eh is when they've been drinking, or when they've been doing a Bob and Doug Mackenzie impression, eh.