I work in an office that does not allow individuals to have their own coffee machine due to fire concerns. Rather, they offer free coffee (ahem, if THAT stuff could be called anything other than hot colored water).
So, the french press is the way to go, and this thermos keeps the coffee hot just long enough for me, which is about 2 hours (don't know why they claim 6 hours, mine is OK for 2-3 hours). I have seen some negative reviews of this product, and I think those folks need to take a minute to work with the product a bit more. Here are my recommendations:
1. If it leaks coffee grinds, then look at the screen. There should be NO bends in the screen along the coil. This is where coffee grinds can leak through. Nissan should replace the screen for you free of charge if you receive a defective screen, which is not all that uncommon. You can also buy replacement screens at local kitchen supply places.
2. If you don't like the super-fine grained coffee that still gets through (I am like this), then do what I do. I place a regular paper coffee filter on top of the grinds prior to placing the screen on top. This does a fantastic job for me. It slows the press a lot, but the extra 10 seconds of press time is worth it in my mind.
3. Rinse the thing with HOT water prior to adding your coffee water. It makes a difference in my experience and helps make for a hotter cup of coffee.
4. Make sure the water you use is HOT. Be careful of some office coffee machines that have a hot water tap on them. This is usually not hot enough for coffee. You may want to use a separate container for microwaving your water to boiling hot before pouring into this container. This is true for all french presses, but the added thermal capacity of this stainless steel model cools the water slightly, so it helps.
5. Between pours, rotate the lid closed so that it is sealed off and won't cool down as quickly. I usually forget to do this, but when I remember, I get warm coffee for almost 3 hours.
In summary, I get fantastic coffee with mine. For those of you that don't, maybe try a few of these tips.
I would give this 5 stars, but I believe they ship too many of these with faulty screens that need replacement (the small bends in the screen near the coil can let grinds come through). This is a minor complaint for the price, though, as replacements are readily available if you don't want to wait for Nissan to send you a replacement.