Domes:
1. Harder to install and setup, 3axis directions never perfect. fitting the cover with the rubber seal falling out (as previously mentioned on IPVM article) very annoying for people.
2. Scratches! few people take the effort to wipe the surface with the correct clothe. using your shirt will put micro scratches on the dome bubble causing IR reflections. A quality supplier will include a microfiber one in the box!
3. Domes themselves in general won't give you that perfect 180degree angle of position, due to the size of lens and the internal structures which never seem to be perfect. Bosh have some unusual shapes domes to overcome this issue, but the cost to produce the bobble part is very high.
4. IR distance must have some minor loss of effective IR distance through the polycarbonate, when you compare to these new Turret styles with equal IR LEDs. Also there is some minor image distortion depending on the zoom level due to the curve part of the dome.
5. After 6months in a Light Chamber to simulate the Sun on a dome bubble surface can and will effect a vast amount of domes turning them off color, and adversely effecting the picture. *WHY well some parts of the world domes are in sunlight for a long time, middle east a prime example. When if you every visit can see there are giant sunshields on many CCTV cameras at road junctions.
6. Cheaper domes may use a poor quality rubber spring loaded surround so lens does not get direct sunlight, however if after some time the lens needs to move you will find an internal mark on the dome bubble, left where the rubber was positioned.
Turrets:
Ugly, but simpler. Time = Money the feeling is the later wins the day.
Domes: when you buy quantity, be sure you have some spare bubbles for later RMAs.
$0.02