Nige, this should be spell checked and written on a big stone plinth for future generations.
Tony - without starting an argument, if you take a genuine albright and a Warn solenoid block apart you will see the differences. This doesn't however make them any less capable, they are simply a copy of a good product which is itself a copy of a good product. Often when the Chinese copy good products they add a bit of improvement along the way.
I think you will find that your basic calculations for full load line speed are a bit too simplified. I don't know the calcs but I think Newton/Meters comes into the equation and IIRC N/m is not a constant force measure but an escallating (?) force.
I also think that individual improvements need to be set to one side - impressive as most are. Steve picked up on what I am writing about straight away and Nige has put the most pertinant point in.
Imagine if you would a Tree Surgeon who does a bit of fencing on the side. He hauls timber, pulls stumps, lowers a fair few branches, does a bit of self recovery. He wants to use Plasma. He has a budget of 1k. What does he buy?
He has a budget of 600 quid what does he buy?
he has a budget of 2K what does he buy?