Fitting twin-slot shelving

I see screwfix and toolstation do it , is their twin slot stuff any good ? spacing of the slots are slightly different from one brand

Height and shelf spacing adjustable Timber or Steel options depending on your requirements; 32mm pitch twin slot bracket for wall mounted twin slot uprights

twin slot shelf bracket ensure the spacing between the shelves suit your needs 10 SAFETY FEATURE: Drop-and-lock bracket design prevents the bracket from accidentally being

twin win slot Uprights are fixed to walls with suitable screws and plugs Space saving alternative to free standing shelving bays Not suitable for