I've seen a few fellow reviewers to videos on them. It looks good, does plenty from voltage drop of a mod, pulsing
coils and such. I just use a tenderfoot stand to build on. A nice circle of wood to work on haha.
The thing I hate about this is, the 521 looks exactly like the Burning Tab Master. Just different colors.
I'm surprised though, no one linked to Super_X's video yet
Thank you Danny! I've had mine since August 28. It's been operating as designed and as expected. I've used it to build and fire 1/2 a dozen attys. No complaints about it. One of the most useful tools in my rebuilding kit.
I have read multiple complaints about poor threading that were resolved by the user screwing and unscrewing a less cherished atomizer into the 510.
Additionally, as mentioned above by others, Coil Master is replacing these units. Mine happened to be fine, at least with the atomizers I've screwed to it - hastur, stumpy, thump, M-Atty.
Additionally I have heard that the product has taken longer than expected to receive form people and that CM had not responded to their emails of concern.
I offer that if you find yourself in a situation where you are not getting the support you deserve from CM, I can reach out to them thru my channels to alert them from a second means.
Now that I realize that these just began to ship to the public a little over a week ago, there were prolly hundreds shipped and they realized and are righting a QC issue, I'd say that it's prolly no reason for concern if you haven't received yours yet. These guys seem to understand that CS means a lot to us.