Warranties are very important. If a manufacturer has less than a 25 year warranty you must ask yourself why. Take a considerable amount of time to read any warranty several times and write down any questions you might have and have the salesperson answer your questions to your satisfaction. If they are willing to verbally make exceptions to the written warranty, then the should be willing to put it down in writing and have the corporate office sign and approve before you sign a contract.
Some manufacturers bury known problems in their contracts nullifying sections of the written warranty. They learn how to do this through past history of problems that have cost them money.
For example: some manufacturers know their logs will bow, twist and warp within a certain amount of time and only give you 6 weeks to have the logs stacked from the date it is cut or your warranty is void. States it right in the contract and most consumers over look it. If you have any delays after the package is cut and ready to ship the clock is ticking. Ask any manufacturer what would happen to the warranty if your builder delayed your project for 6 months and get it in writing because what you sign in a contract is binding.
Do your homework.