Welcome! Personally, I wish I had had the opportunity to try a start-up along the way so I would go for it. As you know, it's not without risk, but if you are on track to ER anyway and are tired of running out the clock in your current job, it sounds attractive to me.
Of course, you could always do the 4-box exercise sometimes attributed to Ben Franklin - take a piece of paper and draw a line down the middle. Write the two options at the top of the columns. Draw a line halfway across the page. In the top half of each column, write all of the positive things about choosing that option. In the bottom half, write all of the negative things. Keep the page handy for a day or two to add more notes as you think of them. This approach has been very helpful to me in making big decisions.
Good luck and keep us posted!
"One of the funny things about the stock market is that every time one person buys, another sells, and both think they are astute." William Feather
ER'd Oct. 2010 at 53. Life is good.