dude, you're comparing a vette to the protege? really? the stock 2.0 liter coilpacks are not very reliable. the 1.8's are marginally better for reliability, and seem to work better with the stock ecu. the 2.0 coils seem to de better with aftermarket ecu's.
for me, it was a no-brainer to do the swap. i had a coil go out, and it was cheaper for me (at the time) to do the swap than to buy new factory coils.