AWeber Private Label services, any good?

Hey yall, so i currently have an account with AWeber, and they are fantastic, ya yea, but now I need to manage a much much bigger list. It is humongous... and AWeber wants to charge me a huge amount of money for it.

Now, there are PL versions of it like turboautoresponders.com www.xmailpro.com www.pro-response.com and they only charge 10 dollars per 10,000 subscribers, a bargain.

Would they have the same deliverability as the original aweber? Are they as reliable?

Thanks!