I use them for 15 years. What I like about these speakers is the flag that sends sharp thunder and are being protected (electric guitar on it with no worries).
For cons, the coil of the speaker is a little weak home (very small coil) but super effective because I used it for so many years without problem toc ... namely that to dpart it is only stereo speakers.
I bought the 7200frs era, certainly expensive for the 2x150W rms but the quality is the same over time. By researching on the web, I have still 700!