I find that typically LFR versions of gear have a more appealing color scheme to me. There's usually something I can't live without in there! However, it's sometimes incredibly hard to get a particular piece or set. It can take weeks and weeks to get the item, on top of having people that aren't necessarily experienced with raiding that can make things more challenging. Trying to tough it up for two toons every week is challenging in itself. With the Siege of Orgrimmar instance being so long, I haven't even ran both every week on both toons like I have in the past. I just don't have time (I have to make time for pvping now hehe).
I'm incredibly dedicated when it comes to something I want though. While my guildies might think I'm insane for continuing to run LFR's week after week, I do it regardless. Aside from having something I really like in there, I also know that after the expansion is over those items with that color scheme will not be obtainable. That is a huge driving force for me. I may complain a ton while doing it in guild chat, swear like a sailor, and vow to never go again, but come Tuesday I'm excited to go and get the chance to get those things I want again!
P.S. I hate Immersius. He won't drop Honey's tank mace for a set that's waiting to get posted, and he won't drop Aynslie's bindings in LFR or Flex. That guy is a jerk!