The Echo is an amazing vape. Its a bit better than Ego autos in that it is 3.7 v rather than 3.5 that an Ego is. Also the Ego autos go off from wind, noise or bumps. Not so the Echo. The Echo realy is foolproof. The cartos it comes with are 3 ml, and known as some of the best. They even sell a Echo 510 cart to fit Ego devices, because people get so tired of Egos leaking.
You can vape off a Echo 650 mah almost all day, and on a Echo carto, never have to refill. You can dangle them out of your mouth loke a cigar without wearing your jaw off, and vape without pushing that anoying button.
The charger is 150mah and does take a while to charge but the up swing is they won't blow up on the charger.
They aren't to expensive either. a bit cheaper that Ego's in price but not performance.
Please look up the Echo thread here on ECF.