I'd be careful with those, to be honest - as lovely as they are, they can get you pretty hot, which you want to avoid at the moment... Also, the danger is that you fall asleep before switching them off - happened to me a couple of times, and I woke up in the middle of the night absolutely roasting!
I'm making do with thick wollen socks, an extra blanket and a moderate hot water bottle at my feet!
i've read that the only reason you shouldn't use them is because you might overheat. (not read this thing about ions though - will get googling... ;-) we have an over-duvet blanket, with a shut off after an hour, so it just warms us up enough to get in, and then we tend to manage. i reckon that's alright. you just need to make sure that you don't get too hot, so maybe stick it on a timer if it doesn't have an automatic shut off?
good idea re DH doing the pre-bedtime warming though!
I put mine on bfore I get into bed to take the edge off, then read for a bit, switch it off, and it keeps me toasty most of the night. Also if I wake in the night and can't get back to sleep I bung it on for 10 minutes and although it doesn't stop DH's snoring, it does lull me back to sleep!