Erm, not exactly sure what you are referring to but would this be the share ownership scheme that they offer to their employees? If so, than it is definitely worth it. Its a zero risk investment.

How it works is like this - you get an offer that allows you to purchase OCBC shares at a fixed price. For a period of 2 years (or was it 1?), you may invest up to 10% of your monthly salary. When the scheme matures, you may pick one of 3 options:
1. Convert the total amount to shares at the offer price.
2. Sell at current market value.
3. Have your money returned back to you with interest.

If the share value has gone up higher than the offer price, you make a profit regardless of whether you picked option 1 or 2. If it goes below the offer price, there's no loss to you cos you get your money back with option 3.

Take up the offer, unless you really can't afford to give up 10% of your salary every month.