I've deployed their various products since 1999, back in the NT4 Terminal Server edition. I have fond memories of running MS Word on UNIX terminals at university by connecting to Citrix running on NT4 on my home PC. Other students would walk past rows of screens in the computer lab all showing drab black and white fixed-width text editors except for one in the middle with a colourful WYSIWYG Windows application overlaid on top of the standard UNIX applications.
I would always respond to the queries about how this was working with: "Magic."
Now? Three large customers are winding their Citrix deployments down. Feels like working with Novell products in the early 2000s.