The REV coaxials are pretty good as mentioned before. But the components I've had trouble with.. twice. The first time was with a customer who didnt want to amp them and just ran them off of HU power... the mids blew in a year. the second install was with them amped at 55watts RMS. Same thing happend.. after a year the mids blew. So on that note, I would stay away from the Components in the series.
The alpines I've had no problems with, both amped and not.