I steep pretty much all of my juice. I definitely notice a difference for most juice between when I first get them and then later on after steeping. I usually just let them sit with the cap on for several days. I shake them here and there and shake them before dripping or filling a carto. Depending on the size of the bottle is how long I let them steep. Generally a few days for smaller bottles and a week or 2 for bigger ones. If the juice smells perfumey or chemically I may steep with the cap off for a night or 2.
My favs right now are:
Altcig : Great sweet dessert juice! I recently started using them and can't complain about any of the juices I have received from them. Juicy Fruit Gum is too light but that's my only complaint, ok? lol. I love Churro - which tastes like a sugary donut with cinnamon, and I love Spearmint Gum - which tastes just like wrigley's gum but with a creaminess to it.
Juicy Vapor - they have hundreds and hundreds of juices to choose from. They make good quality juice. Some of my favs from them are: Dragon's Blood, Wake N Vape, Holy Moly Tea, Artic Berry, Sex on the Beach, Blue Raspberry, Island Vaping...
Mister E-Liquid: Has an excellent fruit and menthol line called their Ice Line - I LOVE strawberry ice, lemon ice, raspberry ice & grape ice!!
Quick Nic Juice - Enigma, a dessert vape, is a must try!! Especially after some steeping. Also great juices from them are their Watermelon Rancher, Lemon Meringue & Banana Cream
The Vapor Room - Always get GREAT vapor from these juices. Recommend you try Blueberry Cinnamon Crumble, a very popular one. Also Peanut Butter Cookie is very popular too, I'm one of the few that didn't like that one lol. A new flavor - Lemon Meringue, I hear is really really good and I can't wait to try it! Cinnamon Danish Swirl is quite popular too.