I bought some SFX1 to try. Just got a 03 Trailblazer. Blue Metallic. It was a 1 owner but my lord does it have swirls and scratches. It took a good 80% or more out fairly easy. It is the wife's daily driver so it is good enough for me. I would recommend there products.
Only Sonus products I have is SFX-1. I used a lot of it, and I might need more. It's my GO-TO polish since it's my not so aggressive polish I have in my lineup. Great stuff!