Originally Posted by
Megamisama
If it took you 4-5 months to clear Flex and not being able to pug normal in that time, then... Yeah, it might be worth doing some arena for you.
I think the 550 ilvl of PvP gear is good. It'll even out world PvP a bit. I'm not too sure of how much PvP power that gear will have, but it should be enough to let you do a bit more damage than upgraded normal PvE gear.
540 ilvl would mean that it's pretty crap in world PvP still. And let's face it, heroic geared players will still steamroll ilvl 550 PvPers in world PvP. It would've been much better if they made the PvP gear ilvl 540 in instanced PvP and instanced PvE content, but ilvl 555-560 in world PvP.
Edit: Do note that even LFR trinkets will still be FAR superior to PvP trinkets while doing PvE content, so Flex won't be completely useless.
(And most people doing Flex + normal mostly do Flex for fun, with friends or for trinkets/set bonuses)