I have been really thinking about this style discussion all day long. The style chart that I use that is ingrained in my mind is based upon all of the different styles of roll I have witnessed not only in my kits, but while being fortunate to have lived in different parts of the country during my military career, judging in the US and Canada, and spending nearly two weeks in the UK with JoeBob many moons ago. Based upon having had rollers most of my life and being in my forties now, these are the different styles that come to mind that I have witnessed and how I rank them in my head. I constantly use this chart to determine my future breeders, I prefer to use only those few that can go 1.6 or better according to my chart.
1.0 Axle, wings clearly outstretched to the side. IMHO, these are lowest quality as far as style goes.
1.1 Axle, wing tips barely visible. Some of these can really spin fast and look great from the side, in fact they look good as viewed underneath as their wing tips are barely visible.
1.2 Low X wing
1.3 High X wing, the style most of us fly, whether we want to admit it or not, or simply can not recognize it and confuse it with H and ().
1.4 A frame
1.5 Wide H
1.6 Narrow H
1.7 ( ) Wings beginning to bow in.
1.8 () Very compact spin, wings give appearance that they are touching during the stroke, even though Clay says they do not. LOL
1.9 () Same as 1.8 but beginning to show a blur, just a bit cleaner as viewed from the side.
2.0 Hard to illustrate, just an absolute blurr.
The above of course are noted by standing under the pigeon while it is performing, not out to it's side.
Now I could go in to further discussion on each style but that is the basics as far as how I rate quality of spin. It is late and I need to hit the hay, but not before I visit the pigeon loft with my flashlight and get a few ideas before I retire for the night so I can dream of future matings. LOL