When it comes to getting a C8 these days, it's not only the salesman that counts. It's the number of allocations each dealership gets, where you are on their list compared to that number and whether the dealership raises you up on the list when others ahead of you drop out. Some dealerships don't move people up on their list but rather take the spot for themselves, order a C8 and then sell it for a tidy profit, much to the chagrin of those on the dealership list still waiting for an allocation. Some dealerships charge over MSRP or add on "standard" extra fees which have caught some Forum members by surprise. Some dealerships charge $5,000 for a deposit and others less. Some dealerships have technicians that are better trained for Corvettes in general and C8's in particular.
Some dealerships have better reputations for being fair with their customers and providing good and timely warranty service in their shop. The service aspect isn't as critical since you can get warranty work done at any GM dealership, however I find it can be helpful in little but sometimes important ways when your warranty work is being done at the same place you purchased your vehicle.
Everyone needs to ask the right questions of a dealership to get the answers to these questions then decide if they want to place their faith and deposit with that dealership, for a C8...or go "down the street" or even to another City to a different dealership, if they get better answers from someone else. And once you settle on a dealership, make sure to get all the important information IN WRITING to have as a future reference, since salespeople change as do sales managers or policies within a dealership can change 6+ months down the road.
I find these things often go from the top down: if the owner of the dealership is fair and honest and values his/her reputation in the business community and with customers, that attitude gets carried on down the chain to the dealership manager, sales manager, sales staff, service manager, etc. So yes, it's nice to have a good feeling about your salesperson (and hopefully find one who has sold several C8's in the past) but it's also knowing the right questions to ask, making enquiries with others on this Forum (like the OP), and checking for reviews on the Web. That due diligence at the start should save you a ton of grief later and not only give you a better chance of getting a C8 but also prevent future misunderstandings when the C8 is on its way and you're doing up the final sales paperwork. My 2 cents. And good luck to all in the hunt for a C8; you won't be disappointed when you're sitting in its driver seat!