I just recently got my Echo-e cartomizer's for my eGo, and here are my first impressions. First off, I was careless when I first opened one to fill for the first time and began shooting juice into the hole instead of the filler. Opps! Once I noticed juice pouring out of the bottom, I slapped myself on the forehead, blew it out, then filled where I was suppose to. Once filled, I only let it sit for about 5 minutes before I couldn't take the anticipation any longer lol! First couple of hits I began to think I may have screwed it up because I wasn't really getting much vapor or TH at all, so I let it sit for about a half an hour longer. Once I replaced my battery again and took another hit, WOW! This bad boy bit me! It looked like my head was on fire! Haha! Awesome vapor production, great taste, and very nice throat hit. I also have noticed it vapes really really smooth compared to the XL cartomizer's I had been using on my eGo. The downside...I am now getting nicotine induced headaches after only like 4 hits. This sucks. Since I am still new to vaping, the only juices I own are all 24mg, but with this new carto it is too much for me. I may have to switch back to my XL's until I can get new juice.
All in all I am very impressed with the Echo-e's and highly recommend them. Just make sure you have some lower dose juices to avoid OD'ing.
