I haven't heard them, only the XXX. I have the RE6.5fr in my rear doors and they sound really good. I just just took a chance on them because I've ran other RE stuff, and just assumed they made all good product. I took out some RF Power 6.5 that were old. The RE sounded better and I could here more detail in the music. I think all are RE speakers are a steal for the price. I wouldn't do comps for the rear. Just get some good 2-ways.