I agree. Even the low priced Harbinger powered speakers sound better in my opinion. When I was shopping for FRFR powered speakers, I brought my Axe-Fx II to my local Guitar Center and tested out all their speakers at stage volume. The QSC K12 sounded like they had a high frequency resonance that made my ears hurt and quickly caused ear fatigue.
I ended up buying a pair of Yamaha DXR12 powered speakers. I wanted to buy the smaller and lighter weight DXR10's but GC had a better sale for the DXR12's. The DXR10's ended up having a good sale a few years later, so I bought a pair of them too.
I know some people that use the Harbinger VARI V2315 and Harbinger VARI V2312 powered speakers and they actually sound really good for being a 3rd of the price of the Yamaha DXR12's and QSC K12's. You can usually get a 15% discount from MusiciansFriend.com too.
No matter what FRFR speakers I use, I set the Axe-Fx global EQ to low pass at 8K. This also prevents high squeal feedback from the tweeter/horn and allows you to use controlled feedback like with a real guitar cab.
I also use my speakers on stands, so they're at ear level, so no need to crank the volume or high end to compensate for a speaker on the floor.