I have Heartfelt beads in all 3 wineadors in the bottom and use Bovedas. I've had the beads for around 10 years and they help keep things steady with no real big swings.
Haven't tried the off brand Bovedas - usually just toss them, but my Bovedas are old too.
Like Mark, I have a recharge setup using a grate above a small tupper with distilled water all packed into a larger round tupper.