I just like the amp brands that rate their power at lower voltages like 12-13V. And screw underrating the amps output for the sake of underrating. Just tell me what it does at normal voltages so I can throw it on 16.5V and turn the gain down to .01% THD to accomplish the same output. I like to keep my equipment happy, not abused.
If you're just looking for brands that consistently underrate their output that'd be a long long, irrelevant list.
Sundown, Nendo, DD, IA, Flatline, SD, B2, Stetsom, Dynabel, RF, Skar, ZED (lol), PG, Powerbass, O2, CT Sounds, MMATS, Memphis, Kicker, Alpine, JL, JBL, basically any brand other than Sony and Maxxsonics (after 2008)