The item was delivered promptly and works perfectly. Easy to switch out as it comes in its own casing that you simply slot into the projector. I am not sure what problem Robin B. Callwood had with the item that meant it was unusable but I have had no issues. My thoughts are that perhaps it was the wrong model, I bought this item for my Optoma HD20. I would recommend checking the serial number on your projector before purchasing, depending on when you bought your projector you may need a different product.
Check the above link and scroll down to the lamp, there it explains whether it will be compatible or not.