[Porsche-O-Phile]

If you can, there's little downside. Although I've heard of companies imposing restrictions on when you can sell (i.e. the stock is held in a company-managed "account" and is untouchable for a period of time before it really becomes "yours" and you're free to move it to your own portfolio, buy or sell it, etc.)

If you have a 0-day limit (meaning it's yours free and clear right away) I'd be all over it like a bum on a ham sandwich. If it has limitations or a time period where it has to "vest" in your account I'd seriously weigh the risk based on your own company's underlying performance factors, valuation and susceptibility to movements of the market as a whole (or sectors of it).

I'd be VERY surprised if ythey were just selling you stock free and clear with no strings or vesting period at 15% off in this economy. If they are, it's almost a signal that they're desperate for cash infusions.