The Tattsbet/Unitab rankings have been mentioned in this thread.

I use them in a Laying the Field method where all runners for a qualifying race must have a minimum of three starts, and it also depends on the price of the fave. The liability for each horse is calculated exclusively on Unitab's rankings and am currently showing a profit on 74 for every 100 races.

If a winning horse is under the odds as per Unitab's ratings there is more often than not another horse over the odds that compensates for it and consequently provides a profit on the race.

I don't know if this is important to anyone but it has got me currently thinking about betting the field as per Unitab's ratings. Maybe someone might also consider Unitab's ratings?