I think attitude is important. Give those IT sales a break will you hehehe?
They are just selling products just like those sell clothes sell watever stuff. So they must act like they know a lot about the product lor. If not how to boost sales rite?
You wan exact information? Then you gotta speak to the developers of those hardware or software products. Afterall they created it and they know inside out of the products. However frequently companies prefer to hide them away in test lab doing development to focus on what they do best. Sales is then done by other mouth sweet personnel.
Be careful of speaking to the developers though cuz you may get what you bargained for. When they speak, they speak their language technical know how hahahaha.... for me I learning to speak business wise everyday. I can't bore my customers with variables, functions, pass by pointers, pass by reference, inheritance, operator overloading stuff inside the software rite?