I have in fact tested two classes of power supplies in this review: the relatively inexpensive A-55GA and P-55GA, and the high-wattage U-75HA.
The first two PSUs are similar to each other and are meant for mainstream PC configurations. They don’t look like a good buy to me because their parameters are not exactly good and their specified output power is overstated (the real effective output power of these PSUs is about 400W). They also seem to be somewhat more expensive then their market alternatives.
As opposed to them, the Vento U-75HA is free from serious drawbacks. Its effective output power corresponds to the specification, and it is stable and quiet. Hopefully, its pricing will make ASUS competitive to other brands on the PSU market.