I'm assuming this will be taken care of through warranty, but at first washing the plunger came apart and we have never been able to get it back together so it will function as intended.  I have seen this same complaint in other reviews, and I imagine this is why it's on sale now.  I hope they are upgrading their design to actually be durable and functional-- maybe there's just a few bad ones in the batch, but I wouldn't buy this again.  Bummer, since the double wall glass is just what we wanted.