You should order some and see if you like them better than double shots, or die sublimated legends on thick ABS or PBT, you may like them.
WASD flexibility to supply you with key caps in the sizes, colors, and legends you exactly need is great, however they use a printing process for the legends on ABS very thin plastic. They used laser etching before and now they are using UV printing with a coating over the printed legends.
Personally, I do prefer Cherry ABS DS, SP DSA ABS DS, and SP DSA PBT sublimated that are very bold legends on material that is thick enough for my preference. I dont like any thinner caps than SP DSA. But again, it is a personal matter.
And as you said I do not like much to buy full sets to just to get the caps I need for my boards and have a lot of leftovers, but I prefer that than to get just the caps I need in a profile, or thickness, or with legends I do not really like.
Ah, one more thing: WASD profile is a little bit taller than Cherry, and shorter than OEM profile, just for you to be aware of it, it may, or may not bother you.