Got my replacement adapter in the morning- damn green light turned off as I plugged it in. Turns out for some reason the power port on the monitor is backwards so you gotta turn the jack 180 degrees for it to go in.
Now here are my problems with the monitor- because of the weird way the 4 pin power jack connects to the monitor it's not fully in- but thanks to the wire routing on my monitor arm it's not gonna be an issue as slightly wobbling it means the difference between the monitor being on and off (also it made crazy sounds whenever I tried to plug it in like it was gonna blow up).
Finally it loaded and OH MY WORD The backlight is maybe a touch strong- but I'm certain that's because my Viewsonic's one was pretty poor.
So I connected the 2 monitors side by side (Old Viewsonic vx2260wm in portrait mode) and the difference in quality is RIDICULOUS. This Shimian is nothing short of devine, and cos the seller tested for dead pixels I can confirm I double checked it has NO dead pixels right now.
So yeah, the quality difference is so big it actually pained me to see my good ol vx2260wm that I've grown to love over the past few years. Even the extra 1080x1920 real estate wasn't worth it because the 2560x1440 panel can fit 2 windows side by side without compromise (and at a better scaling than the portrait monitor).
Eventually, I gave up my Viewsonic to my bros so they're using it right now 2 TN panels and I've decided to stick with just the 1 Shimian monitor.
I've also checked to see if the difference in input lag made any difference on games like Street Fighter 3: 3rd Strike, SF4 Arcade Edition 2012 and Marvel vs Capcom 3 and I can confirm there's next to no difference. It's definitely 1F or less of lag.
The scaling on the 360 + Shimian is VERY good, you really can't fault it picture looks better than ever could not pick up on any stretched pixels.
Of course I have no data to prove this but when you've played as long as I have you can definitely tell the difference between ~1 and 1.5f of input lag.
I'm honestly really damn happy with this monitor I dunno what else to say. I genuinely can never go back to using a TN panel again- no matter how good it is.