This is not going to be an in depth review cause I just got them from Nhaler, and I'm trying it for the first time, but here goes. WOW! Have I finally found what I've been looking for to put on my Riva 901? So far, YES I HAVE. Loaded it up, only was able to get in 1 1/2 mm, then let it sit for a while. So far plenty of vapor, and TH for me, and the flavor is good. Oh, and this works w/o an adaptor on the 901. Now if you will excuse me, I need to sit back in my chair and enjoy this.