I actually use both services today so I can keep this review up to date. Overall, I think Aweber has a better deliverability rate which is a huge reason to use them. Furthermore, i like the way they do autoresponders much better than MC. On the flip side, MC has a much easier to use API if you are into coding and manipulating your lists programmatically.

With Aweber, it is very easy to sort through your list to find out who hasn’t confirmed. But as far as I can tell, there’s no way to send out an automatic reminder. However, you can do this manually since you have their email address. Plus I believe you can tell if they’ve even looked at the confirmation email so you can sort out who you want to remind vs someone who is truly not interested anymore.
You can turn off confirmed opt-ins in AWeber, but it’s not recommended, which your story verifies. One of the reasons that AWeber has a high deliverability rate is the lack of spam going out via the service. So when importing a list it does suck to have to send out a bunch of emails, but it keep their service up and going, and our emails being delivered.
I suppose the secondary reason I haven’t made the switch is because I run multiple blogs and don’t want to get stuck paying multiple fees at this point. (I’m under the impression I’d have to pay separately for each email list, but please correct me if that’s not the case. That would change things.) I love the functionality and features of Aweber, but I can’t see paying 4-5 monthly services fees while so many of the blogs are in a start-up phase.
Migration can actually be a major pain in the ass. Although according to aWeber my list was “substantially clean” but I still needed to get all my readers to reconfirm their subscriptions. After a week I’m still waiting for 70% of them to reconfirm. NOT happy. If I stuck to mailchimp I wouldn’t have had these problems. (Their support guys are good though.)
Just so you know, I am quite a newbie to this brave new world of autoresponders.  Before I started this site (rather, I migrated from a previous platform to this self-hosted WordPress platform), I had not even heard of autoresponders.  But since the beginning of this site, I have adopted a new attitude: from a lackadaisical blogger to one more focussed on the possibility of building a long-term business.
Do most people open your emails on desktop or mobile? Email messages opened on a mobile device have nearly doubled over the past 5 years, while emails opened on an internet browser have dropped 26% in that same timeframe, according to a study from Return Path. If you find your list trending toward mobile, too, then aim for short email subject lines (35 characters or less). (Not sure how your audience reads your emails? Services like Litmus and Email on Acid can track which devices your subscribers are reading their emails on.)
AWeber offers three email editors: a drag-and-drop WYSIWYG editor, a plain text editor, and an HTML editor for those who prefer to code their own emails. The WYSIWYG editor is pretty easy to use and allows for a fair degree of customization, though not quite as much as I would have liked. You can insert a simple “Click here” button, coupon, logo, or signature with the click of a button. Social share buttons are easy to generate once you link AWeber with your Facebook and Twitter account. Drafts are autosaved every two minutes, and you can see a list of previous versions (so that if you accidentally delete something, you can usually retrieve it).
Think about implementing referral links to incentivize your subscribers to spread awareness about your brand, too. Referral links allow your current customers to promote trackable links for your business. In exchange for sending new paying customers your way, you can give them incentives like discounts, coupons, vouchers, cash, prizes or redeemable points.
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