We have very recently opted for the DotMailer platform (beginning of July 2012) and are very pleased with the system and service we have received.
We had a number of key requirements which needed to be met (mutiple logins and the ability to manage users amongst others) which we all adequately met. Also the way it handles data is very straightforward.
We are now in the process of putting together our 'Easy Editor' templates in-house which is coming along well. My only suggestion would be to support mobile email in this area, you can't add CSS styles or @media queries it appears, which is a shame. But overall for the functionality, slick interface and price Dotmailer is a very competitive solution. We are very happy with it.
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