Microsofts VPN Server

I was wondering if anyone might know of how secure Microsofts VPN is using RRAS. My manager wants me to find out if this is a secure solution for about 100 salesforce users and our IT department to connect using this type of VPN. I looked on Technetbut all I see are good reviews of coarse. If anyone could steer me toward any good articles or is using this feature please let me know what you think. Thanks in advance.