Well I though the Bushranger was a reasonably priced but looking closer I see they have it listed at RRP $462 - that's getting up there.. if Super Cheap's is from the same factory.
The ARBs ones made for airlockers do have that small reservoir tank and auto cut off switch. I find this very handy - with one of those servo type valves and gauge attached at at the tyre end, you can walk around pump up tyres just like in a servo. The compressor starts on demand.

