Sometimes the wisdom of the crowds is a bit circumspect. Not in this case -- listen to what most everyone here is saying.
As for advice, make it a business decision. Take the emotion out of it, look at it objectively (as much as you can), then take action.
Don't be concerned with personal relationships with the "founders". They're presently benefiting from your participation much more so than you are of theirs. If they're worthy of your friendship, they will understand when you depart. If they react badly, they were never good relationships to begin with.
As for your reputation, just be productive. Startups all over the valley need productive engineers; they do not need more people pontificating about others. If you do that, your reputation will take care of itself.
As for advice, make it a business decision. Take the emotion out of it, look at it objectively (as much as you can), then take action.
Don't be concerned with personal relationships with the "founders". They're presently benefiting from your participation much more so than you are of theirs. If they're worthy of your friendship, they will understand when you depart. If they react badly, they were never good relationships to begin with.
As for your reputation, just be productive. Startups all over the valley need productive engineers; they do not need more people pontificating about others. If you do that, your reputation will take care of itself.