Not really. It all depends on what you're looking for. If you're not carrying extra weight and just want 2 more inches for some extra tire clearance to go offroad AND want to retain the factory ride (some people like the softer ride of the factory suspension), then the lift spacers fit the bill.
In terms of offroading, there's really not a huge benefit to the OME kit other than a bit less deflection when coming off obstacles. But hell, the load levelers will solve that