I have this monitor and really enjoy gaming on it.
Keep in mind that it's a VA screen, vs the other common IPS or TN types. VA has really good black levels and contrast, but has slower refresh than TN or IPS. You will get blurring, even at 144Hz. On the other hand, due to the way the pixels are arranged, 2560x1080 looks sharper than an IPS screen and doesn't color-shift like a TN does. As big as this monitor is, I really don't mind the low-ish resolution at all. Makes it so I can actually get a solid 144Hz in most games. Also, thanks to the large curve, the VA glow in the corners is greatly reduced.
My favorite feature on this monitor is the black-level adjustment. It does a really good job of increasing details in dark scenes without washing everything out or making blacks look grey. (like most IPS screens do)
Worst feature of this monitor is that if you want to attach it to a VESA mount, you have to buy their special BenQ adapter plate ($37), which came out to $42.51 with shipping direct from BenQ (only place to get it).
I should note though... I got my monitor at Newegg for $599 on sale, no tax, cheap shipping. If you're patient, it sells at that price on occasion there. Otherwise, the deal here is the best I've seen for this monitor, plus Massdrop takes care of their customers better.