I think the best / newest is the SRG-BLS, although I haven't seen any of these available in Europe.
The SDX801 has been available for some time, and seems well proven (i've run one). They then released SRG-BL, which I'm running currently. These 2 were similar in price.
They then released SRG-BLX and SRG-BLX type R. I'm not sure on the difference! Then the BLS came! These last 3 seem to have come quite quickly between each other.
Then to add to a little confusion, looking at Ronald's car at the Euros, he seems to be running a "full size" servo, and all of the above are the slim line that many use in touring car.
Not sure if this helps!
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Matthew White
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