Those TW 4075's glow red hot within a couple of seconds of 6volts, I managed to make 1 last 3 hours before it died. I've got another that glows what appears to be white hot under 6v and it still works albeit with incredibly hot vapour (obviously). I'm not sure how people are managing with 6volts on a Prodigy(I'm aware of the 5v version) without killing lots of atomizers. Must be black magic or something.
Good review

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Hi Googled.....
Yeah you right the 4075s are even hotter than standard 901s but even 901s don`t like 6v ha-ha!
I just been using old tired attys I keep as stand by ones to try 6v and as you say the vapour very hot and not for me anyhow!
Like I said in vid though, It seems to give the atty a good clean if you just blast it for few secs? so maybe a new atty cleaning tool? (I personally just treat them as disposables though, at price it not worth all the hassle of boiling them, kissing them or whatever ha-ha!)
I chuck mine in the standby box after a week or so but always nice to have some "just in case" attys lying about
I am just waiting for adaptever 6v and bits and pieces to come, then will do 6v on 801/510, but up to now really happy with the bulli for long time vaping without battery changing, and build quality very good, just not 6v on 901 ha-ha!