I did the blue foam last night and it works well. I'm using LR 510 cartos during the day, as it's easier for me to swap flavors out at work with cartos. I'm liking both attys that came with LUX. They produce a cooler vapor similar to what I get from my Joye Stick V3, but vapor production seems better from the LUX. I typically prefer the warmer vapor I get from the LR cartos, but the LUX must put out more volts (a good thing) under load than the Riva as my cartos are getting very warm at tip when I power hit it for awhile. Somthing I do not experience with the same cartos on the Riva. Guess I"ll invest in 510 drip tips to spare my lips 