The Shick Injector blades cost around $0.80 each. That's relatively expensive compared to DE blades at aroun $0.28 each. The Gem blades are around $0.34 each which doesn't look too bad until you consider they have half the edges that the DE's have.
Yes, but the Gem blades are thicker and give me a shave that is nearly as close to a straight you can get.