We also evaluated F5 and Barracuda WAF.

The reason we were comparing Citrix Gateway to other solutions is to ensure that a VPN can be used on a desktop, for third-party security reasons. 

We don't want a situation in which a person can connect to his desktop, but is forced to use our environment using Citrix Gateway. There is no need to use the solution if one wishes to utilize Cisco VPN for connecting to Azure via VDI or to remote the RDP into it. However, Citrix Gateway gives one a better picture of place. Its administration is a bit better and it makes the creation of videos easier and faster once it's set up. 

My advice to others who are contemplating using the solution is that going with Cisco is preferable, even though Citrix Gateway is a good product. 

yes, the major players on the ADC and remote access space.

We looked at VMware View in some projects.

We haven't looked at other solutions, because our client preferred Citrix NetScaler Unified Gateway, so we had to comply with that.