Summary: I use 6 of these along with two powered subs every week for around 14 hrs/week. I have replaced three circuit boards because of overload. It costs around 100-150$ to replace the board with higher end components. There are several places that you can send them to for the repair or you can buy the board and do it yourself if your techie that way. It is the most common problem with these speakers. While it can be a pain sometimes they are still worth the money.
Summary: They work fine. I use these as a back up for my JBL EON's. they don't have as much power as the eons, but hey, for the price they're pretty dang good! I run them out of the HPF on my EON subs so it hey don't clip much. But if you're looking for a top cab for regular use, look elsewhere.
Summary: Sound great. We use them for our Southern Gospel Quartet. The only thing I notice is a slight high freq noise if turning the high freq EQ up. Very very slight noise though. Highly recommend. Great low end!