Guess it will depend on your material, Phil. If you look at what other products are around, it really comes down to whether or not you like the actual system. For me, I do like the Kreg even though the joints have a tendency to pull offline especially if glue is also applied. But I think that the same criticism could be levelled at other jigs.
So I look at the drill bit as a consumable...bit like Fein blades.