Cloud-based Enterprise Fax Solutions

Hello,

I am just looking for some suggestions in cloud-based enterprise fax solutions. What are you using and what do you like and not like about it? Any Office365/Microsoft integration is a plus. I know print drivers are available for about any solution. I'm just looking for any bonuses over what a entry level fax server would have. For example, Biscom has Sharepoint integration and OCR based routing apparently. Does anyone have any experience with the following?

A quick list from Gartner:

Biscom

Concord Technologies

Easylink

Esker

Graphnet

J2 Global Communications (eFax.com)

Retarus GmbH

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Thank you!

-fg