I have the Persol 2965 V and they are definitely not too flashy. I have interviewed (and landed) jobs at very conservative, large firms and worked in business formal and business casual environments and they do just fine.
This is coming from a junior employee who would be ripped on for wearing, for example, cufflinks and french cuffs. The Persols are definitely not too flashy.
They are great glasses, hope you pick up a pair.