Product review (5 stars): So far so good.
Wanted to try a Refresh brand filter because the price was reasonable. I'm giving this filter a tentative 5 star rating because it fit perfectly in our LG refrigerator. The initial few gallons of water did have a "gray" look because of small carbon particles but it quickly cleared up as expected. This is quite typical of carbon filters.

But, since filter performance can only be judged on flow rate, color, taste ,smell and longevity I'll need to wait a few months for my final assessment.
Being the nerdy guy I am, I have already cut open a genuine, used LG filter to check out construction.  I'll do the same with the Refresh filter after I finally remove it.  My expectation is it will also be a typical carbon block design and will be just fine.
UPDATE:  Okay, I did cut open the used Refresh brand filter and found it to be constructed well, as expected. In some ways ( for example the internal water flow channels )  I thought the design was better than the more expensive LG filter. Otherwise, the Refresh filter uses a typical carbon block to achieve good performance.  I'll keep using them. A good value.