Upgrade to a frontlighted reader is only worth it if you're often in a situation where you can't read due to lack of light (because your partner has to sleep, or you didn't pay your electricity bill, or you travel alot in trains which do not have lights over the seats, or whatever).
I wanted it for the same reason you do (new gadget), wasn't sure whether to get it or not, ordered it, cancelled the order, got it shipped a couple of days later anyway, returned it after a day.
If you need the light, the FrontLight HD is a nice device. I would recommend it if it's to be the first eReader for someone. It's easy to use, light is great, and it still has page flip keys so you don't have to smudge the display all the time.
I still returned it because, I didn't really need the light after all. And there'll probably something better out next year... who knows?