There are definitely both pros and cons about this product, but overall it's pretty good and it really depends on your preference. I was kind of contemplating whether or not to purchase it, but you can't really beat the price.

Pros:
Good size. I usually wear a medium shirt, but I don't always know without trying it on. I was worried that this wouldn't be true to the size, but it really is. It's maybe a little loser than I like, but it still fits fine.
Doesn't show cleavage. This can be a pro or a con depending on what you like, but for most, I think it's a plus that this rises high enough not to show your cleavage.
It's long. I like long tank tops. These ones might be a bit long for some people, but I like them.
Adjustable straps. Good for people of different heights.
Comfortable.
Super fast shipping.

Cons:
Very thin material. The one thing that would have made this product better would be thicker material. They are good for layering, but you especially can't wear the white ones alone. I also ordered a charcoal and that one can be worn alone, so that's good. I'm not too worried about quick rips and tears, though.
No built-in bra. I tend to like a built in bra since it adds a little bit more support, but these didn't come with one. I knew that ordering, though.