Pointless price is $49.99; however, on the flagship, it’s $39.99 here:
https://www.amazon.com/Razorri-Solido-Complete-Sharpening-Stone/dp/B07YDLHGWW
Picked these up awhile back on a similar deal and they do a good job but there are a few caveats to consider:
You DEFINITELY want to use the flattening stone before trying to sharpen your knives; mine were pretty uneven and the corners were especially bad. Once that was done, however, the stones have been great for the price.
Secondly, double-check the grit markings, mine were off where the grit numbers were swapped on the stones (e.g. 400 was really 1000, and visa-versa). You’ll want to check yours when you get them since there are a few Amazon reviews indicating others have had this issue. Minor thing but can make the sharpening process frustrating if you start with a finer grit on a duller knife that really needs the coarser grit first.
If you’re considering these and haven’t really done much knife sharpening previously, just know that the process take a lot of practice; I’d recommend starting with some less valuable non-serrated steak knives to get the process down. Also, there are a lot of decent instructional youtube videos out there that can really help you figure out the sharpening process.
All-in all, there are some “cheap stone” shortcomings but, once you get to a point where you can find a good rhythm and can keep a consistent angle while sharpening you can get a really good result.