I'm really not sure what other reviewers are talking about when they mention the offensive smell that these slippers have... Mine smell somewhat like lavender and it's not really that noticeable.
I also have figured out that you can put the slippers in the microwave without disassembling them first.  I put them in for 1-1/2 minutes and I'm good to go.
Yes, they are hard to walk in so I mainly use them for when I'm going to bed.  My feet get very,very cold in the evenings so these have made my life so much happier.  I can fall asleep faster and if my feet get too warm during the night, they are very easy to slip off.
I have tried other products to warm my feet up before going to sleep, like an electric blanket and an electric spa foot bootie but I have to say, I love these microwaveable slippers the best.
I almost didn't purchase them based on the reviews here but I'm so very glad I did.

***UPDATE***  March 10, 2011
OK, I've had a chance to really use these slippers and I have to say...  after a while of using them, they really do have a strange smell right out of the microwave.  This "smell" is something that's not really offensive but rather strange like an herb that's been burned...  If you know what I mean...  LOL.  Yes, I know that's an even stranger description but it's all I can think about when I pull them from the microwave after 1-1/2 minutes.  And, I have to say that it's only when I hold them to my nose that I can smell them at all.  It's not like it's making the whole house or even my bedroom smell this way.
I guess the other reviews were partly correct.  Some I think were a little exagerated.
I also think that the company that manufactures these slippers knew or knows of the problem and that's the reason that when they first arrive, they smell nice and fresh like lavender.
Oh well, I still love them and will buy another pair just to have a backup incase something happens to these.
I'm wearing them right now as a matter of fact and I don't smell a thing.
I hope this updated review was helpful.