This is exactly why I don't go into Car Audio shops anymore...
1. Most of them don't know what the eff they're talking about. Good knowledgeable shops are few and far between.
2. They talk about how great 'their' product is... and trash everything else. Amateur salesmen, with a pathetic approach to sales.
3. Then you go back a couple months later, and they have dropped that line and picked-up a new brand... same cycle; trash the old line, and hype the new stuff!