Is my Salesman telling the Truth?

Your salesperson may be relating his own experiences truthfully so I can't argue there. That said: I must emphasise that my own experiences with "networked design cables on single wire post speakers" has been very satisfactory.

3chihuahuas: if you believed "your sales guy" was spoutin' bull dung, why didn't you tell him? i find it fascinating that so few consumers - of damn near anything - are unwilling to confront uppity salespersons, even politely and diplomatically. my view is that silence in the face of bullshit begets more and smellier bullshit. unless you're in the fertilizer biz, speak up or stay away. otherwise, you're gonna' wonder one of these days why everyone's avoiding you while simultaneously holding tight their nostrils. just my opinion, FWIW. -kelly

CORRECTED POST
3chihuahuas: if you believed "your sales guy" was spoutin' bull dung, why didn't you tell him? i find it fascinating that so few consumers - of damn near anything - are willing to confront uppity salespersons, even politely and diplomatically. my view is that silence in the face of bullshit begets more and smellier bullshit. unless you're in the fertilizer biz, speak up or stay away. otherwise, you're gonna' wonder one of these days why everyone's avoiding you while simultaneously holding tight their nostrils. just my opinion, FWIW. -kelly

Kelly, sometimes I have to "hold my tongue" and walk away in many cases because if I get started I may not have the control to hold back if things get heated and the bullshit is flying out of some fool's mouth. I am very passionate about the truth, and have a bad temper that I am not proud of. (My silver hair used to be red.) Salesmen who call on me in my vet practice are very, very careful. I have been known to excort them to the front door and somehow that word spreads. [:)] I wish I had thicker skin, really. Charlie

Some salesmen are very honest - usually the ones making either a lot of money, or barely any money.
A year or so back I visited a local high end dealer. I said I was buying a set of speakers and an amp. I mentioned that I had my heart set on a Wadia 850/860 w/direct outputs, so I would not be needing a preamp. The guy ripped up my choice in front of me, insisting that Wadia was garbage & that I should look at 'good' players like the ones he sold. I read his store newletter which had a similar bitter diatribe against Wadia. I thought 'why?'. Anyway, a few months later I mentioned the 'odd' experience to a local friend/audiophile. He told me this guy used to be the area Wadia dealer and had gotten into a fight with Wadia. My friend had actually purchased a Wadia player from this man, and was given the holy hosanna's about how great Wadia was at the time. Goes to show.

I would really like to see some of these obnoxious windbag 'experts' like him lined up and asked to identify, unseen, the equipment they sell. Honestly I find it sometimes takes me a few days to determine if something is better or worse.

Of all equipment I feel that cables are indeed the most system dependent. Try a few out, and see what you like !