Sorry for bump but just thought I'd do an update for anyone interested.
I purchased the xl2420z from amazon UK a few days ago and it arrived yesterday.
It's running V1 firmware, more specifically "V001-20131126". The manufacture date is January 2014.
Considering BenQ said V2 will be implemented into production from March I assume V2 wont be available from Amazon UK until June. I say this because it's April atm and I received a monitor manufactured in January (3 month difference), so I'm guessing monitors manufactured in March wont be available until June.
My experience with the monitor and with blur reduction in particular are unimpressive SO FAR. I plan on updating the monitor to V2 firmware as I'm certain Bbusters strobe utility makes a significant improvement after reading other peoples experience with it.
However these are my thoughts so far:
Using Bbusters moving photo test there is quite an obvious ghost image a couple millimeters behind the main image with blur reduction ON, i'm guessing this is strobe crosstalk. To be honest it's so bad in games I don't see any point in turning blur reduction on. Maybe my monitor was configured poorly but it does feel like Benq didn't even bother trying to configure this feature properly. Alternatively I could just be particularly sensitive to the crosstalk as my previous monitor was an IBM P76 (CRT) running at 100Hz and anyone who has used a 100Hz CRT before will know how fluid it looks.
Although blur reduction looks different when on and off, the end result of both is about the same when it comes to image clarity. Personally i prefer the slight blurriness of 144Hz+blur reduction OFF compared to the persistent ghost image caused by blur reduction ON.
Currently I don't see any options in the OSD to try and improve the strobe crosstalk, but hopefully once I've upgraded the monitor to V2 firmware I'll be able to configure the blur reduction to make up for this poor optimization by default.
Anyway apart from all this blur reduction + V1/V2 firmware malarkey the monitor is pretty much awesome

Everything else seems to have been really well thought out, I love the adjustability the monitor stand gives you and the 144Hz panel on its own is great once you play around with the colours and add an ICC profile. The monitor itself looks great too and has more ports than I'll ever need.
Overall I'm happy with the monitor and hopefully it gets even better after upgrading to V2 firmware and trying blur busters strobe utility
