Getting a lot of the same questions so I just want to address them. 1) We will not receive another offer, there are no other offers possible. I can't fully explain this without blowing my cover, but suffice it to say we're very confident in this. It revolves around our extremely niche market. 2) A huge part of the reason we're afraid of blowing this deal is what I just stated in #1, since there are really no other ex…
If it's as you say, I think the question to answer is "Can we stand to be employees again, in particular, as employees of this company?" If you can, then this starts to look more like a job offer, in which case you need to negotiate more cash up front and more favorable vesting terms. (This may also explain why the future employer says the tone will change if bankers get involved. They probably see this as a talent acquisition with revenue attached. Getting a lawyer involved makes sense no matter what.)
If you can't see yourself as an employee, then my guess is that you're fearful that your market is going to go away (and the acquirer may suspect that you're road kill). In which case the thing to do is start trying to diversify outside the niche as the current niche revenue stream winds down. Is there time to do that?
End of rampant speculation. Good luck.