Quick Question RE: Getresponse Co-registration

Hey fellow Warriors! I've had this question for some time now about the differences between AWeber and Getresponse.

I have been using AWeber for about two years now and I like them very much. They have good service and their deliverability rate is super.

However, I have been looking into Getresponse's co-registration deal they have.

Here's how their co-registration system works. When you subscribe to someone's Getresponse list or unsubscribe, it has a list of other subscribers lists that you can join. You can join several at a time, or you can pass on. You do have to pay for this service though.

AWeber does not have this type of marketing.

I was just wondering if anyone has used this service with Getresponse?
It is called Get-Subscribers.

Is Getresponse about the same as AWeber?

Are their deliverability rates the same?

Which Autoresponder Service do you prefer?

I would not want to to change services without some feedback and see if it is even worth it.

Thanks,
Gilbert Medina