POLY is POLY, no matter who it comes from it is the same liquid that makes them, they use different chemicals such as dyes, hardeners, elasticisers etc.
You can even mkae your own if you want to go to the bother of making moulds, which can be made from pretty much anything as it does not readily stick to moulds.
Colour has no bearing on hardness or SHORE rating, it is only the COLOUR OF THE DYE USED, it's natural colour is a cloudy white colour, same shade as glue sticks you can get for glue guns.
I use deflex as these are not a rip off unlike some.
There is a potentila for failure in any make of bush, usually due to trapped air in moulds.
There is no magic science to these bushes, a kid could do them, the POLY arrives in drums, you mix it with what you want, you pour into moulds, you let it set, take apart mould/pull out job done.
A lot make hype about injection moulding, this is purely because it is done on a large scale and adds nothing to strength of bush, just another AUTOMATED PROCESS as it is quicker cheaper to do.
At the end of the day if people gie you a lifetime warranty there cannot be much wrong with them.
DEFLEX for example made their name in OFF ROAD 4X4 stuff including events such as PARIS DAKAR, as well as all the top known ones, so are not going to be bothered by the stresses a car are going to throw at them.
tabetha