Those Feathers are quite a bit more expensive, but you should really try buying a sample pack as you may be surprised to find one or two alternative blades that work really well for you. But if the grocery store ones work well enough, that is good.
My Edwin Jagger DE89 shaves great, but I did find the original handle could be a bit slippery. The iKon handle has been for a solid grip, and looks like it will last forever as it is solid stainless steel without any coatings.