Okay, so we just established that quartz counters are really nice. Does that mean that they don't have any warts? Not exactly. Just about any product you choose for your home comes with an upside and a downside. It's all a matter of weighing the highs and lows and how they appeal to you.
So let's take a look:
Because it's non-porous you don't have to worry about any bacteria, germs and other undesirable vermin setting up home on your countertop. It's also much less likely to stain since there are really no "pores" for spills to accumulate in.
No Ongoing Maintenance Required
As a result of being non-porous, quartz countertops don't need to be sealed like a natural stone counter does. That means you won't have to clear your counters every one or two years to seal them.
Consistency In Color Patterns
This is a matter of taste but quartz countertop color patterns have a more uniform look than some natural stones. However, a very slight variation still may occur because the ingredient itself" quartz" is a natural ingredient which is subject to variation.
When you buy a slab of granite, there may be large variations in the color pattern from one end to the other. Some like this, others don't. This is all natural from mother nature. With quartz counters you're assured of getting a consistent color pattern throughout.
No Health Concerns
Many brands of quartz countertops are NSF-certified meaning they're safe and won't harbor harmful bacteria (NSF is a non-governmental, non-profit organization advocating healthy standards for foods, water and associated products). Quartz counters also don't have any radioactivity and pose no potential health threats like those associated with radon in granite countertops.
Last but certainly not least, quartz countertops are beautiful and it comes with variety of colors.
...and the Cons...
Not Immune To Damage
Quartz is a hard material but these countertops are an engineered substance and they aren't immune to chipping. They'll take the everyday normal use but they're not indestructible and can chip or crack if hit it very hard. This is same for granite.
General Heat Tolerant
You'll need to use trivets and hot pads to protect the surface for hot pot or pan. This is same for granite. Be safe than be sorry.
Quartz slab manufacturers make their products in uniform sizes, typically about 4.5 feet wide by 10 feet long. Large or expansive countertop designs will require multiple slabs and resulting seams.
Sensitive To Some Household Products
Quartz counters can also be damaged from exposure to chemicals that have high or low pH (highly acidic or alkaline) like rust removers, aluminum brightening compounds, heavy duty cleaner, bleach and others. Granite is much more sensitive to chemicals. Generally speaking, use soap and water for both materials, instead of chemical cleaners.
Aside from diamond quartz is the hardest material around. So it's very hard to scratch quartz. However, that doesn't mean your quartz countertop will never scratch under "any" circumstances. If you place a stone or rock on top and drag it across the counter, it will scratch. But common sense would tell you that is not a normal activity or usage of your kitchen countertop.