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Craig02
This may sound ridiculous but I assume that the "Game" mode preset would be the best for games?
Yes, you need to use Game Mode. Not only would you lose the 4:4:4 RGB reproduction but you would also have an input lag of around 80 to 100 milliseconds (maybe even higher) outside of Game Mode, which is unplayable.
the only Motionflow setting that preset has is "Impulse"
Yes, the only Motionflow setting available in Game Mode, as is the case on the 2013 models, is Impulse. It's still pretty much unusable because of the severe dimming and flicker it introduces.
Also would having Motionflow enabled add any significant lag or would it be negligible?
Impulse, or LED Motion Mode on the W7, adds a couple of milliseconds, but is negligible because the lag is so low to begin with.
Finally is Motionflow a good feature to have for games or is it better suited for movies etc?
It would be great for gaming, if you could access the useful Motionflow modes, i.e. the normal settings that make use of frame interpolation to reduce blur. Given the fact that everything but Impulse is not available in Game Mode, you're only option is to use them for movies, sports etc.
With all this in mind I am overall trying to decide if I should stick to my plan for the W8 or should I be reconsidering the W7.
I would reconsider the W7, yes. If you don't need or want the 3D and use the TV mostly for gaming, where you can't utilize the Motionflow settings, the W7 would be the better choice (imho). Lag will be lower on the W7 (although probably not noticeable) and everything else is also there. Also considering the fact, that the 42W8 has passive 3D, there is the possibility of noticing the horizontal lines of the polarization filter, which is not present on the W7 or active 3D sets.
I think John Lewis has the 42W705 in stock for £629,95 right now. I'm not from the UK, but I read good things about JL and if you're not happy with the TV you could return it or maybe swap for the W8.