I'll add there are other strategies that have worked for me in the past with clients.
In some jurisdictions here in the US you CANNOT void or disclaim implied warranties, including merchantability or fitness for a particular purpose. In some places writing "as-is" has zero applicability. Depending on circumstances of a transaction, where/how you advertise, you could get sued in that other state even though you think you're under your local laws.
I go look for a trans and say I need it to hold up to track use in a 400hp car, you say it's good for that, you had it built to that level. Turns out it had stock 250hp parts and blows up. I prove the parts wouldn't hold to 400hp, could be you're in trouble depending on the circumstances of advertising and sale. EVEN with as-is.
Other jurisdictions require an acknowledgement in writing, on the face of the sales contract, in the same prominence (and sometimes greater) than the rest of the signed agreement, with and separate signature, waiving any implied or other rights to be effective. Sometime even that needs another acknowledgement of having the right to consult an attorney about ramifications before signing.
There's dozens of things more I had done over the yesrs that worked. People think as-is or caveat emptor covers/saves all, but the reality is it really doesnt.
Whatever you sell, be prepared to stand behind it for what you sold it as, and, save evidence of what people said they wanted/expected. As long as you're willing to back what expectations you can PROVE the buyer represented they had, for the price you're getting, then make the deal. Otherwise, IMO it's foolish the proceed thinking you can hide behind as-is or any other waiver.