Mailshake is a suite of tools for teams sending sales emails, including pre-written emails, follow-up scheduling and send controls, merge fields and customization / personalization, in-built monitoring, and both an API and Zapier integrations, notably with Gmail and Google Suite.
I found it pretty good - we were able to put email templates and campaigns together almost immediately. The reason I gave it an 8 is because if you want to edit those templates, the saving and making sure they were part of the campaigns was a little tricky and not intuitive.
Quick support. They offer very extensive and detailed tutorials on how to use the tool, as well as how to succeed in sending emails the right way. It probably reduces the number of support tickets and general support needs. The videos make it very easy to use their solutions. Great way to educate new clients.
You can use Mailchimp or SendGrid for similar use, with Mailchimp the email automation is limited, and SendGrid holds up quite well. However, Mailshake is strictly designed and well equipped for email outreach and unusually cold emails, and its usability is second to none.
I'd say it was a net negative for us because the initiative did not lead to sales for us. It was probably HOW we were using it, and not the fault of the product itself. If you have luck with cold emails, and just need a new platform, Mailshake could be a great, and inexpensive option. Our loss was mostly employee time, and learning what doesn't work for us is a positive in the end.