I have only 3 different horizontal coils on hand to make a personal observation from but when has that ever stopped me?
I do see from the pix posted of the rare problem on a few Echo cartos combined with the 3 I have open in hand right now, the only thing they are doing the same is making the coil horizontal.
The pix of the Echo shows a larger contact area around the coil which may lead to the enhanced flavor many report. The GO-GO seems to use a lot less glue and simply lays the coil horizontal and puts a dab of glue to hold the tube and coil in place. No glue taste but not as much flavor as the Echo.
The Ego Mega and a no-name (believed to be an SLB) regular use diffferent methods from the 2 already spoken of. Overall though I personally feel the large capacity horizontal coil is the future of the carto for not only amount of juice held but better flavor and/or durability. You have to think at some point (hopefully sooner than later) that one of the methods for a horizontal coil will be adopted by most other makers.
Look at the Ego - they hit a winner at that stage of e-cig development and many months later, you'd have to take off your socks to have enough digits to count how many reliable and proven copies there are made of it. Hopefully, the same will hold true for horizontal coil cartos.
EDIT: Here is a picture of one method of attaching a horizontal coil as done by Kanger. The Echo's are done by Hangsen.
Not a good snap as it was with my Droid X but serves the purpose. Note how the two "prongs" of the coil are attached. The tube was removed to make this into a dripper and where some have too much glue, this almost has not enough. The white coloration at the top right of the inside is light glare, not glue.

The pix of the Echo shows a larger contact area around the coil which may lead to the enhanced flavor many report. The GO-GO seems to use a lot less glue and simply lays the coil horizontal and puts a dab of glue to hold the tube and coil in place. No glue taste but not as much flavor as the Echo.
The Ego Mega and a no-name (believed to be an SLB) regular use diffferent methods from the 2 already spoken of. Overall though I personally feel the large capacity horizontal coil is the future of the carto for not only amount of juice held but better flavor and/or durability. You have to think at some point (hopefully sooner than later) that one of the methods for a horizontal coil will be adopted by most other makers.
Look at the Ego - they hit a winner at that stage of e-cig development and many months later, you'd have to take off your socks to have enough digits to count how many reliable and proven copies there are made of it. Hopefully, the same will hold true for horizontal coil cartos.
EDIT: Here is a picture of one method of attaching a horizontal coil as done by Kanger. The Echo's are done by Hangsen.

Not a good snap as it was with my Droid X but serves the purpose. Note how the two "prongs" of the coil are attached. The tube was removed to make this into a dripper and where some have too much glue, this almost has not enough. The white coloration at the top right of the inside is light glare, not glue.
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