OK let's see how this goes:
The Fosgates are a far better than the original ASK speakers (size, weight, design) and the Audisons are very solid and smooth and just give that extra base needed in an open car. You could spend a lot of money on sound systems on these cars but they are sports cars and may not get the full value for money. These options add enough to make the system demonstrably better IMO. I already have the Sound Plus Package (non-Bose) and the dash mounted tweeters are all fine and integrate well with the new door speakers, with no apparent upward or downward masking effects. I also like the plug and play aspect, without having to deal with the rewiring and impedance challenges of new 2-way or 3-way speakers.