None I can think of.

Overpriced and false advertisement.

If you look at Pioneer site and Crutchfield, they'll say
35Hz-some high frequency. Look at the box. It drops down
some 40-60 dB starting at around 100Hz. Frequency response
to 35Hz my a&#. I'm not much of a car-audio fanatic since
it's already too noisy in a car. (Have a bi-amped valve-pre
Bryston-power amps and Magnepan) Even for a car market, I
can't believe the kinds of false advertisement they can get
away with. At least I didn't pay anywhere near the MSRP.
For what it's worth, the mids and highs don't sound too bad.
BTW, MSRP isn't $200. It's $85 if I'm not mistaken.

Don't know any

No bass compared with factory speakers with small magnets.

Replaced an otherwise wonderful '89 Maxima with factory Bose (Blows?) with too much mid bass and nothing else with a '95 Maxima with standard radio/cassette and was so impressed with both real bass, treble and midrange that I was afraid to replace the radio or speakers to get a CD player. Finally bit the bullet after much Crutchfield shopping... and ordered these speakers and a Kenwood kdc2009, both of which looked good on paper. The Kenwood has an awful radio (fm reception terrible with plenty of signal power everywhere... I'm a city dweller. The first ominous news on the speakers was a frequency response graph on the box that dropped like a rock below 100hz. Surprise, some mid bass, no real bass (40-100hz) low efficiency (they claim 90... I'll bet 88) and no highs or midrange either.

Any reasonable 6.5 ought to do nice bass in infinite baffle (trunk) configuration. Don't know where to go from here!

But don't buy this product.