Are EVGA power supplies any good?

The supernova G2, P2, T2, and B2 are all made by Super Flower (very very good).
The supernova GS and PS are all made by Seasonic (also very very good).
The rest are made by an assortment of manufacturers, FSP, HEC, Etasis, and some others (bad to mediocre).

Of these, the G2, P2, and T2 are the best.
 
EVGA offers several very good to excellent power supplies.

I maintain a power supply recommendation list that listed in a sticky at the very top of this forum section. Here is the link:

http://www.johnnylucky.org/power-supplies/psu-recommendations.html

Scroll down to the EVGA section and follow the links to the technical reviews. The reviews will give a fairly good idea of the performance and quality of the different models.

I also maintain a psu lemon list of power supplies to avoid at all costs. Here is the link:

http://www.johnnylucky.org/power-supplies/psu-lemon-list.html