I use the Xikar gel in my 120ct and it is rock solid I love it. I use a 250 bar in the lid and a small jar below the tray. However I do keep a close eye on it for mold. I only use PG solution in it but after @huskers showed me what can happen I make sure to watch out for mold. The crystals also keep your RH closer to 65% - 70%. I just can't afford beads yet.