My only argument against these is that they are supposed to be paring chisels yet they are using A2 steel. Pairing chisels are pushed, not struck.
Nice that they have fully polished backs but again, I’m not sure if that is a solution is search of a problem. You are only registering right out at the business end where you need to have downward pressure to make the cuts. So if the back were a little hollow it doesn’t matter. If the back was convex, well, that is another story and they should be rejected.
A2 steel, in general, requires a higher bevel edge (>=30*) to maintain its edge without chipping. All has to do with the crystal sizes. Their text expressly calls out a primary bevel of 25* which is common but a further 5* (effecting cutting angle is now 30*) for edge retention.
A pairing chisel, traditionally, maintains a lower cutting bevel (<30* possibly even as low as 20*) to afford better slicing across the grain. O1 or W1 type steels take that lower bevel pretty well. As do some of the White and Blue steels used in Japanese designs. The powered metals are a whole bunch more voodoo and some of those formulas are also great if rather application specific (they are engineered materials after all).
A very quick scan of the description doesn’t turn up a length or measurement of the size of the lands but they do look both long and thin which are good features in a paring chisel. Ideally you want to be able to slightly flex the chisel as that can help get it into tight spaces.
Blue Spruce was bought by Woodpeckers a couple years ago. I thought Jeske made great stuff. Not sure how involved he was in the design and material selection on these chisels.
My opinions of tool design are wholly my own and based on a love for and use of a mix of vintage and modern (both the pedestrian and premium) brands. They are worth exactly spit.