I don't trust ANY dealer or manufacturer (be it audio, automobiles, appliances, sporting goods, etc.) who would badmouth his competition.
Once I hear that crap my money goes flying out the door never to return. How stupid (or desperate) can some of these people be?
The ironic part is that good dealers (regardless of the product) don't need to badmouth their competitors. Good dealers can sell on their merits (experience, knowledge, stability). When I lived in Oregon, I had a great dealer who knew my preferences. On one product, they flat out told me that I would prefer the competitors product. Guess who always got my business and my recommendations for others. That dealer is still in business 20 years later.

