Marketo is great for companies with longer sales cycles. It may be too expensive for smaller companies with more transactional sales.
I use HubSpot to manage both marketing to our leads and prospects, and member communication with subscribers to our SaaS product. Because we are a very small company (5 people) with no dedicated sales team, we have to be able to move our leads through the sales funnel with minimal direct interaction. HubSpot allows me to study what's working and what's not so I can spend my time fine-tuning our efforts and outreach.
It's great if you are looking for a simple, easy to use out of the box email marketing platform. The important thing is to try and pair it up with a CRM solution that will host your contact data, and then allow you to synchronize with MailChimp rather than use the email forms to collect data. We use Workbooks CRM which has an out of the box integration with MailChimp and allows us to really make it easy to send out our campaigns.
It's only well-suited for departments who can invest A LOT of time into it in order to take advantage of everything it can do. For the cost and learning curve it takes, it really has to be fully integrated into the marketing team's every day. There's so much functionality that I don't think we even know every thing we're capable of doing at times. We have an employee who specializes in Eloqua, which really is a necessity.
I will be strongly recommending a new system, particularly as our company grows from a smaller startup to a mid-sized company. While Act-On claims to serve the "Fortune 5,000,000" I think they are probably better suited to budget buyers.
We use Pardot in the Sales and Marketing departments. Pardot is our primary lead / prospect tracking and communication platform. We are using Pardot in conjunction with SalesForce CRM to identify, segment, and distribute leads to our sales team based on territory automation. Pardot allows us to consolidate our marketing funnels, for the most part, so that we don't have to reference multiple platforms or databases to understand our funnels.
Constant Contact was an incredible asset of our company's Investor Relations / Marketing team. It's ease of use and reporting capabilities really impressed not only me, as the main user, but the entire company up to our CEO.
I think it's an awesome product and haven't found another one quite like it. I tried MailChimp once and it was a nightmare. We use Salesforce to organize our leads and we can easily upload them into groups of the iContact platform.
I think for a company with a fairly small customer base, AWeber is on par with similar programs like 1ShoppingCart & Constant Contact.
Smaller less technically staffed companies should avoid it. For mid-size companies with a serious need for a email solution, it might be worth considering if the staff involved in using the product isn't afraid of technically looking stuff.
Our experience was on selling large items in small quantities, e-mail automation worked pretty well. In the selection process, we asked about the Magento e-commerce integration and checked the usage of Emarsys interface.