Setup required: Navigate the OSD to create custom resolutions
Cost and availability: Sold second-hand online, generally more expensive than Corio2 scalers
Top: Corio2 tvONE 750. Below: DIDO Jr.
The DIDO LT, Pro and Jr. models by Aurora Multimedia output buttery smooth 240p, and the Jr./Pro have the added feature of image rotation and X/Y axis mirror flipping. In essence, they function very similar to the Corio2 scalers, and have an easier setup and slightly more intuitive picture controls. However, they are sorely missing a 480i output. Given their scarcity and higher cost, get yourself a compatible Corio2 tvONE instead.
Verdict: Seldom Recommended