Since the weather has not been that great over the past few months, I have not been able to do much testing with these products. I have a targa top from a Corvette that I used to test a few of the products out on, but it is yellow and pretty beat up, so it wasn't the best test panel.
I tried the P1 polish on a twisted wool pad, followed by a black foam pad and my initial thoughts are good. It worked in very easy with the wool pad and didn't produce any dusting. It worked very nice on the foam pad as well. Seemed to remove a fair amout of scraches and left the finish pretty glossy, but who knows what kind of results you would get on a black vehicle with a fair amount of defects? More testing is needed to evaluate this product.
I used the G1 nano glass coating on my girlfriends SUV and my fathers SUV and must say that I am *very* impressed with this product. I applied it to a clean windshield with a make-up remover pad, let it haze and then used the G1 residue remover to take it off. The first time it rained, the wipers skipped a little bit, but after a little while they stopped and worked normally. The water sheds of amazingly well and you don't even need to turn the wipers on over 40 mph. I have had it on my girlfriends vehicle for almost 2 months and it is still working pretty well. I have only had it on my fathers truck for a short while. Both of them love how it works while driving on the highway and driving in the rain at night. It is a very nice product and would consider buying a bottle it it is not too costly.
I tried some of the C1 nano crystalline coating to a small section on the targa top. I applied it with a make-up remover pad as well and wiped off immediately with a microfiber cloth. Looks were pretty good, but it was hard to tell any difference on the bright yellow paint. I poured some water over it and it beaded water nicely, but so didn't the rest of the top after I had polished it with various products. I'm not sure if I really want to use this product on one of my customers cars because of the silicone content. I am going to wait until I have a perfect test car before I apply it to a complete vehicle. I was discussing this product with Rydawg and we are both nervous what kind of long term effects of this product are.
As for the Scholl products, I have done a little bit of testing with them and plan to do a full review in a few weeks.
