I bought myself a Nook ST Glowlight right before Christmas, and have now bought two more - one for my gym bag, and one for my husband. One refurb off eBay ($89), two refurb from Fry's online ($79 each), no problems with any of them.
And, no, I will never go back to a non-backlit e-ink device.
Prior to this my main reading device was my Android phone, precisely because it was backlit. But with the phone I always worried about running out of battery before the end of the day, and not being able to actually use it as a phone if I needed to. I still read a lot on the phone since it stays in my pocket and is handy for standing in line and other times I don't have the Nook with me. But I mostly read now on the Nooks.
I especially love that I can put the Glowlight on just a bit, almost undetectably, just to improve things when in low light, and also that I can turn it off completely if the ambient light is good.