I have the Panasonic NI-L70SR Cordless Iron and I love it. I don't think it gets as hot as the corded iron that I had before but I love, love, LOVE not having to fiddle around with the cord. It is 1500w and does a good job with steam. I've had it for about five years now.
It does have an auto shut off but a warning light blinks before that happens. Since I'm usually in the sew, press, sew, press mode it has never been an issue for me. Also, even when it does go off, it reheats very quickly.