I just want to clarify my earlier post that may be misinterpreted.
i'd rather take my chances shooting a homebrew approach with a non certified but extremley feature rich and flexible gps like a garmin 496 than i would with a cumbersome and purpose built certified unit like a 430. In fact i'd rather use an ipad with sd than a 430.
this was purely hypothetical, i haven't and would never do approaches this way and would strongly advise anyone considering it not to.
I was merely commenting on the user friendliness of different guidance systems.