I don't have a lot of experience with the Boveda's but, from what I have used them I kinda thought they messed with the flavor but, I still use them to try and keep my stuff from getting drying than I want but, I don't just leave them in my jars all the time, partly because I think the 68's are a touch too moist, I plan to get some of the new 58's that they have now and see how they do.
I started a thread about them and there was some discussion about whether or not they affected terpenes.
https://www.thcfarmer.com/community/threads/boveda-58-rh-packs.84853/