the one they sell at elk101 is a good easy to use call, if you cant do the diaghram thing. if you can, they are the only way to go.
and check out the elknut videos, they have a ton of great info.
Ive never used the carlton one you had, so have no idea how it sounds, but my thoughts on those primos blue reed babies, are that hunters can usually tell its a person with one of those, but it doesn't seem like the elk always know. there are better ones for sure, but those aren't the worst ive seen.