As an experienced retailer, I entirely agree. If they can understand what the customer is trying to achieve, a good retailer will be open and steer the customer towards what they can supply, demo and support. Indeed this is how I came to know about the Longitude -- I mentioned the Salsa Fargo 3, and the chap in the shop showed me the Longitude in the Genesis catalogue. So I went away and looked at it some more, compared the specs, read around the forums etc, and made a call back to the shop to ask if I could take a closer look.
So: the LBS did exactly the right thing, at first... they pointed me to something they did know about, and had supplied before. Where it broke down, IMO, is that I wanted to have a look at one in the flesh, and take it for a ride, and failed to achieve that in any LBS. This led me to
Evans, despite the original lead coming from the suggestion at the LBS.
So a likely outcome would be that I go to Evans, check it out, like it, buy it. And the LBS loses out. Which makes me sad.
The more substantive point raised last night is:
what would I actually get out of the demo ride? If the answer is actually: very little... then that would suggest I should just buy the bloody thing from the original LBS in the first place. But that goes against the grain - I'm not super keen on spending £1000 on something I've never seen.