Yeah, the Vex is about as large as I'm comfortable going for an EDC. Plus, the design of the Vex is a fairly benign looking design. I had one guy at the office comment that it looked like a kitchen knife. A knife like the new High Street from Busse, while actually having a shorter cutting surface than the Vex, looks a lot "meaner" and is more likely to get some eyebrows raised as an EDC.
The scrapper 5 definitely looks like a hunting knife, and I could see that throwing people off and making them uncomfortable.