For Born2saw....yup....tried the Eagle Nano. I have a black coupe and I noticed a lot of imperfections in the paint as well as "spiderwebbing...swirl marks" whatever you want to call them, the ones you see around the reflection of a street light in your cars surface at night. The product said it was good for "filling in" those small type of imperfections. I thought it worked great. Very easey on and off and I did see an improvement in the light swirl marks.
Im not doing this as long as some here, but I have tried about ten different products. Some of the ones spoken of here [McGuires....Mothers...Zaino] as well as others. Some were polymers, like Rejexx (not a wax.....the long winded explaination was all about molecules lining up and bonding....XX% more reflectivity...impossible for stuff to stick to it...] it did produce an excellent shine but I found it to actually enhance the swirl marks

.
Now I know that anything you put on the car requires the proper application and prep of the surface [and btw, I did not do the more then five coat process outlined above for the Zaino, so what I bought probably wasn't the full product and as such I can't say I tried the Zaino] but I did work on the car with a clay bar, a polishing cleaner (a wax ...not a buffer.....I dont trust myself doing anything other then a hand application) and a sealer, but never really got every little mark out.
A friend who has a few nice cars (actually a little better then nice....he has one of only eight in the US of a certain type of porsche

) told me he had done a fair amount of research over the years and saw studies that showed a product [P21S] that supposedly came out on top overall. I din't see the study, and I don't know what the criteria was......long lasting...best shine...but he said it was the best he had found.
I later found it (in an Auto Zone believe it or not) and decided to give it a try. A little on the expensive side, like $25 for 6.5 ounces. Very simple ingredients......carnuba wax and bees wax.....thats it. No perfume, no abrasive, no other chemicals....zip....nada....just wax. It looks like a paste but it's practicaly clear. It goes on easey and although it dries a little hazy, nothing seems to come off on the cloth.
It is hands down the best stuff I have ever put on the car. I dont know whether it is because of the consistency (seems thinner than regular wax when you put it on) or what, but it seems to fill in the barely visible marks I spoke of before better then the other stuff I've used. For the first time, Im satisfied with the finish on the car. Prior to trying the P21S I was considering getting the car buffed out by a professional. After using this stuff, it's like a mirror

I'm going to leave well enough alone, very satisfied at this point.
Don't know about how long it lasts, (but that's my fault, I like waxing it

) but after the second or thrid coat (over a few weeks), wifey thought I had the car painted

Just my opinion but it's the best I have found so far. [btw, not that you can tell anything from the pictures in the sig, but they were all taken before the P21S]