Just started using some Boveda packs for the first time...has only been about a week, but so far, no noticable decrease in smell or flavor using the small 4gram 62%'ers in mason jars. Just peace of mind that the jars I don't have a hygrometer in aren't getting close to the all-dreaded 55% RH as I came close to overdrying this time! Kinda pricey but well worth it.
Oh forgot to mention...no you will still have to burp your jars as usual with Boveda packs, as the curing process needs fresh air to continue allowing the microbes to do their thing.