and,
How will you deal with the issue if your shares become worth far less than anticipated? Watch out for blue sky predictions.
If you are discounting your services they can be discounted even further by a lower than anticipated share price, especially a year or two out when you would be in a position to cash out.
IPO shares are gravy, not compensation IMO. They are incentives to retain you, not compensation for the work you do. Take care of yourself first and then knowing that your needs are met, IPO shares are an early retirement.
Had 60,000 shares of a pre-IPO compensation package. Negotiated a compensation if the IPO did not come off or there was a parting of ways regardless of the share price before selling them was an option. While it was a second job, it came in handy that no matter what, I wasn't tied to a do or die IPO.