SAFE docs are short 5 page documents with very little to negotiate (just the valuation caps). Therefore, startups and investors won’t have to spend a lot of time and legal fees on hammering out the details of a safe. An outstanding SAFE would be referenced on the company’s cap table like any other convertible security (such as a warrant or an option).
A SAFE doc is not a debt instrument, so it doesn’t accrue interest or have a maturity date (so it might not convert to equity at all). SAFE requires a company to be incorporated, not an LLC, like many early stage startups are. If a company is in the form of an LLC, it may have to pay legal fees to consult with a lawyer to convert to a C-Corp. Safes are also only about 2 years old, created by Y Combinator in Dec. 2013. (So angel investors, VC’s and attorneys often have less experience and trust in using a safe over something more established, like a convertible note.)
If you have questions about whether your startup should use a SAFE or interested in having an attorney draft one for you then feel free to shoot me a message or check out. Good luck!