I just picked up my echo-e cartomizers from the PO (arrived yesterday from cropduster, tyvm) and I must say so far I'm impressed. I've been glued to my Reos for the past 3 weeks and only ordered these to see if I could find a use for my 5 ego-t 1000 batteries.
1st Impressions: Easy to fill, took about 30 drops (lost count and didn't overfill), vapor is plenty, taste is excellent, and while a bit cool coming from 1.5 306 attys on 3.7V Reo, I still like it very much. I don't taste the fill like I usually do with cartos. It's also rather fun using a cig shape again as opposed to a box. So far no leaks or juice in my mouth, just even smooth, flavorful vapor. You can take really deep, long hits with it, which give you a real nic rush.
The soft whistle shape mouth piece is unique, (no chambers on it thankfully) and feels good against the lips. It's strong enough to grasp it with your teeth and hold the heavy 1000 ego-T battery if you needed you hands fast, but obviously can't vape it without pressing the button. I can pretty much tell with a lighter automatic battery, you could vape handless for a while. I never did that with cigarettes so I personally don't have the need, but nice to use your mouth as a third hand to hold it. None of my ego-A, B, 510, 901, etc drip tips fit it, so it's the mouth piece or nothing. Glad I like it.
Now if the built-in atomizer holds up, it can be vaped close to dry without burning, and it lasts a long time, it's a winner in my collection for the variety and portability. I'll report back to the thread when I know more.