Has anyone tried these Pre Load Adjusters by Off-The-Road and are they any good.

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2009 XT660R:-DNA Stage 2 Air filter. Dunlop D606 tyres, Puig Screen, Ventura H/Lamp Guard, W/Pump Guard, TT CNC Gear lever, TT Brake Pedal Ext, GYTR Skid Plate, Oxford Heated Grips, Cameltoe Sidestand Puck. EGO Barkbusters.
09 KLX 250s, 2011 CB1000R.