So I want to create some rear view mirrors, I have seen some scripts that can reverse the image to give the effect of a mirror, but ive also seen some threads saying that Unity Pro has good built in features for mirror effects.
In two weeks I will have unity pro, so my question is should I try to create the mirrors in Unity trail with script, or does unity pro offer some built in features that I should just wait and use?
I dont know about this feature, so u may find my answer not appropriate. But why u want to wait 2 weeks, when u can get unity pro trial for 30 days at anytime? So, u can see if it works or no, and u will not wait 2 weeks to find it out.
I used my trail, and i dont advocate multiple trail accounts 
But yeah i could, but im not under any time constraints so il just wait 
Your best option for rear view mirrors is going to be render textures, assuming you want the mirrors integrated into the scene, at least.