I would highly recommend doing each of the three steps. All three products (Reflection, Thunder, and Lightning) are meant to work together.
The Black Ice Trio of Protection is 3 step system with a polishing, sealing, and waxing step. Here is a more detailed explanation of each product.
Black Ice Reflection: Reflection is a chemical cleaning polish that prepares the surface for Thunder and Lightning. Not only does Reflection clean, Reflection greatly adds to the gloss, reflectivity, and slickness of the paint. Reflection leaves some protection behind but I would not use it alone without topping with Thunder and Lightning. Lastly, Reflection contains no abrasives and will not remove (or fill) in swirl marks. Reflection is very easy to work with by hand or by machine.
Black Ice Thunder: Thunder is an acrylic sealant that provides long lasting durability coupled with great shine. The anti-static properties help reduce dust accumulation. Coupled with Black Ice Diamond (anti-static quick detailer) you can greatly reduce the rate that pollen/dust accumulates on your vehicle.
Black Ice Lightning: Lightning is a liquid carnauba wax that delivers solid protection as well as the extremely wet look. The resulting finish has lots of depth and is extremely slick. Lightning is very easy to apply and just as easy to remove.