Ash
vaporist
HF - The top is a screw on. It looks like there is a silicon o-ring in there, but it would not be replaceable (if that's what you're asking). It certainly couldn't become dislodged. It is exceptionally easy to one-hand. The seal opens when you press the button. You then have to keep the button depressed in order to drink. When you release the button it seals automatically. So, you really couldn't operate this with two hands if you wanted to. If you use it at work this is really cool because it is actually impossible to spill on your desk. A second after you let go it is already sealed. As for cleaning, the mug is too narrow for me to fit my hand into, so you need a bottle brush to really clean it out. As for the autoseal mechanism, I've never had a problem. I clean it with soap and water (using the bottle brush), and run it through the dishwasher once every few weeks or so. I drink my coffee black, however, so there's a lot less crud to build up. I will say that all the other fancy-top mugs I've seen, like the OXO or the LiveStrong, are much harder to clean than this one.
I understand wanting to make the right choice. I probably spend more time with this device than any other I own. Not even my TV or my vaporizer gets this many hours of use each week.
There are two things to point out to someone buying this, though, that I don't see as a problem, but should be noted. First, the seal is so tight that pressure builds up in it after you add your hot coffee and screw on the lid. When you first vent it you don't want it pointing at your face. This is instinctive now, and I was never really burned, but it sure surprized me a few times at first. Second, because there is no lip, like most mugs have, the coffee goes straight into your mouth. This makes it difficult to get a sense of how hot the coffee is before it actually hits your lip or tongue. It took me about two weeks to get used to this. However, if something happened to my mug now, I would replace it with another one without even thinking about it.
I understand wanting to make the right choice. I probably spend more time with this device than any other I own. Not even my TV or my vaporizer gets this many hours of use each week.
There are two things to point out to someone buying this, though, that I don't see as a problem, but should be noted. First, the seal is so tight that pressure builds up in it after you add your hot coffee and screw on the lid. When you first vent it you don't want it pointing at your face. This is instinctive now, and I was never really burned, but it sure surprized me a few times at first. Second, because there is no lip, like most mugs have, the coffee goes straight into your mouth. This makes it difficult to get a sense of how hot the coffee is before it actually hits your lip or tongue. It took me about two weeks to get used to this. However, if something happened to my mug now, I would replace it with another one without even thinking about it.