First off I have the KR 808D-1 and the Riva.
The X-power is KILLER!! These cartomizers M-301,orM-601 Hit great with tons of vapor and great air flow even with the cone attached somethiing the Riva has a hard time with. These carts will hold about 1.1 ml of liquid and air flow is perfect. I got a box of prefilled Mboro, which is one of the best tobaccos I've had. I got some blank cartomizers that have the removable hard cap, but it states on litecigusa website that these caps are still easy to take off. Well I don't know what tool they are using, but lets say you won't be taking them off with a paper clip. I used a strait tip type screwdriver device and just about destroyed the caps taking them off, but no problem as I could fill them just as easy with a syringe and needle using a little of 1ml of liquid and puting the needle down into the filler squirt a little a keep moving around until syringe is empty and no leakage out the bottom. Much better than the 501 cartomizer in every way. The only problem with the M-301,601 carts is I don't see that many on the internet, but there should be these things are great. Much better than the kr808 and 501 put together.
I didn't buy an atomizer, but I'm going to order some Monday with blank cartridges.
Now on to the Ecig itself. Its beautiful and feels great. Black Matte finish with chrome bottom and chrome button, but, which this is cool even though the button and bottom look like solid chrome they are transparent. The button glows blue like the Riva and the bottom lights of orange, which the Riva doesn't. I really like the feel of the button and the curvature of the neck around the button its perfect. The battery life is tremendous. I've been vaping all day like 8hrs and still going strong and I'm I heavy vaper. Like I said earlier the finish is a matte black with a very smooth finish not slippery just smooth. The only thing I could want is a huge variety of prefilled Cartomizers out there because I just like them better. Well thats not exactly true. Blank cartomizers that I can fill would be more like it. I hate the attys and cartridge. Get yours at Litecigusa.com
Hope this helps
PaulC