Here is my opinion.
Correct me if I'm wrong but please don't shoot me.

If you want to go for coating, you have to be prepared to do regular maintenance - wash and dry it every week and also wash and dry it after raining.

A coating is hard. Harder than waxes.
It is also thicker. Some people say they can't feel the metal of the car body after coating.
A coating is better than wax when it comes to protecting the paint from colour fading and bird bombs.

The problem with coating as some users have found out is watermarks.
Because a coating is much harder, when watermarks form on it, it is also much harder to get it out.
Watermarks on waxes are easier to correct because wax is softer it requires less effort to sacrifice it.
Usually people who have spent a lot money on a coating also wouldn't want to DIY

A coating is definitely more durable than waxes and in the long run is cheaper too.
If you were to send your car for a 3 step clay, polish, wax it'll cost you say RM200 each time.
If you do that twice a year for 5 years, it will come to RM2000.
A Sierraglow coating is less than that ..... I think  

Anyone who wants to have a nice and shiny car ..... there is no shortcut.
Either you spend lots of money to pay someone to do it for you or you spend less and do it yourself.
The other option is to just have a clean car (wash whenever you feel like it) instead of a very shiny one.