Thanks for the guidance Thomas. I think I was just generally trying to get a feel for people's impression of Cerwin Vega.
The system is currently stock 1994 MKIV. The previous owner did upgrade the front speakers to Boston Acoustics (4", not certain what model), but the rears, sub, and I'm guessing the tweeters are stock.
It is my understanding that Cerwin Vega makes decent speakers that are best known for their efficiency (providing decent sound in low power systems). So I'm wondering how whether the effort to replace the speakers is worth it with a stock system or mild upgrade to the HU and amp. The speakers are in the stealth series (now discontinued as far as I can tell).