I have been building a SAAS product for a vertical industry for the last two years. The product is now pretty mature. As a geek my sales and marketing skills are pretty rubbish so am are looking at getting a new 'co-founder' who is an expert in sales, but unsure what equity would be considered fair. I am considering 60/40 split. For a startup that already has a product that would seem pretty generous. If we were starting from scratch obviously it would be 50/50.
Before deciding on a 60/40 split or awarding any equity, you may want to consider the following:
Hope this helps.