All of these coatings will lock in what the paint looks like in its current state, they do not fill any kind of swirls or scratches. As such they require compounding and polishing the car until the finish is as perfect as possible. Then the paint is cleansed of all oils left over (with an Isopropyl Alcohol wipedown) and the coating is applied making sure to knock down all high spots before it cures.
Opticoat 2.0 is essentially adding a thin layer of permanent protection on top of your clear coat. The user version (Opticoat 2.0) is a little bit thinner compared to the Opticoat PRO that Optimum Polymer Technologies only provides to professional detailers for application.
Professionals best describe Opticoat as a "wearable clear coat". Basically it helps preserve the clear coat on your car as it would "hold" scratches and swirl marks that you could polish out and not wear down your factory clear coat.
Comparing Opticoat and CQuartz, supposedly the CQuartz requires re-application after some time. However, most people prefer the CQuartz for a show car finish look as it adds more depth to the paint when compared to Opticoat.
The drawback to these coatings is since they lack "oils" like a traditional wax/sealant, they tend to water spot easily. Some say that nothing would stick to a coating after being applied, but what most people do after about 90 days or so of applying a coating is they apply an additional sealant over the coating; the most popular being Sonax Polymer Netshield, which makes the water bead up very tightly and greatly reduces the water spotting.
My opinion on the matter is to first learn how to properly maintain the finish of your finish (proper wash techniques to PREVENT scratching and swirling ESPECIALLY with the thin water based clear coat that Holden uses on these cars). Then it would be worthwhile to have your car "corrected" (polished to remove defects) and apply Opticoat 2.0. 90 days after application apply Sonax Polymer Netshield. Do your regular maintenance washes and reapply Sonax Polymer Netshield every 6 months.
The coating and sealant will keep a lot of things from scratching will good washing techniques and will ensure a flawless finish.
You can also apply the Opticoat or CQuartz to the wheels to keep brake dust from doing harm!