These are some of the best speakers on the market. They play any kind of music with absolute clarity. They take some time to break in, but once they have, the sound is amazing. i've listend to the other speakers in its price range, from alpine to infinity, and have found that these are supurior in almost every reguard. They have worked great at our schools tailgates (along with a pair of 12" Rockford P3's in the back!) in their ability to play a wide range of styles with a slightly warm but crisp sound. I highly recommend them.
These fit the rear deck of the E60 BMW (5 series, 2004+). The tweeters are slightly smaller than the existing tweeter, and need to be secured. The woofers drop-in unaltered. The sound of the RVF-210's is quite good for a 4". The metal tweeter may be a bit bright for some, but they are articulate and can be pushed quite loud before they begin to break-up.
I chose the RVF 210 due to their shallow mount depth a clean looking grills on top of already impressive performance. I mounted them in the front doors of my '87 5 series and they look great. The mids and highs are well balanced and they helped bring the soundstage about 5 inches above the dash. Although one of the woofers stopped working after about a week, I was still impressed with the build quality and performance as well as endless mounting options.