It is a great product that makes LEDs behave more like incandescent bulbs in terms of smooth on/off transitions and dimming but does not take anything away from the benefits of the bold looks and low energy/heat use of the LEDs.
Also, unlike some other mod makers that are all the buzz right now, the seller herg does not spam the forums trying to sell the product to everyone to squeeze every ounce of profit out of the sales as possible, and the price/profit margins have been kept reasonable compared to most other mods that required significant engineering.