99% sure the new Oplock kits are just Dobinson gear rebadged. I stop working for them right as the new suspension was being distributed to stores. So up to you, but I'd say as long as they get your weight right, you should be fine.
One thing i got told by many of the suspension mobs while working in the industry, is that there is only two suspension manufacturers in Australia, everyone else either orders from cheap overseas factories, or they are made at one of those two companys using either the companys design for the vehicle or their own design( IE tough dog, lovells, efs). The two companys were Dobinson and King Springs. Not sure if its all true but it makes sense i guess.