We have a different perspective; use the best tool for the job at hand. Illustrator for most design because that's what the designers coming out of school are trained to use. We export as PDF for all print, import either directly to print manager or to Flexi Design to apply contour cuts. Use Flexi design for those (many) simple print/cut jobs where you just need a set of truck numbers or a really quick, simple yard
sign/banner design. It's easy for our production coordinator to design and go right to print. Yes, we've had occasional color issues, but always in the end it was user error such as not checking the color settings in Flexi Design before sending to Production Manager.
A word about SAI. They are without doubt the BEST company I've ever worked with to problem solve. Responsive, US based service by people who know what they are doing. Rare in today's software world. Yes there are problems, but keep in mind it is software designed specifically for our business and they have a great set of tools that make us more productive. Try getting any kind of support from Adobe. SAI will no doubt eventually go to subscribe only to eliminate some of the variables that come with supporting multiple software versions and to even out revenue. Let's hope the service doesn't degrade.