The downside to that unit is that it requires specific replacement cartridges, which subjects you to purchase specific filters.
The more traditional rodi's use 10" canisters that can simply replace the resins and or filters independent of manufacturers. It makes it so that you can shop anywhere when it's time to service your unit.
Now, there is a quality factor in choosing a long lasting rodi. Because they're not all made the same. I had some Amazon special 10" filter housings that started to leak at the molded plastic seam. I'm not sure if price dictates quality, nor do I know how to identify ones that will last longer than others. But something to be aware of.
Personally, most of my rodi unit is pieced together with spectrapure components, and I have nothing negative to say about their products.
But if you ask my honest opinion, you definitely don't have to use a name brand to get the same results, you just might be prematurely replacing parts and cleaning up leaks from subpar components.