I've been hearing for over 2 months now that there is going to be a better belt coming out for the ultra vacs from my dealer. I've had to replace 7 belts on my 60" XS lazer. Machine only has 300 hours on it. The belts are lasting about 35 hours. When I install a new belt you can watch the belt stretch out. After about 10 hours of mowing the belt is stretched out and max's out the tension pulley. You can hear a difference in the fan speed and in wet conditions (morning dew) it does not throw the grass up the tube as it should. I've been running the belts until they finally start rolling over in the pulleys and fall off. At about $15 per belt it is going to get very costly over the life of the machine. This is one of several complaints I have about my 07 lazer xs. If you have an answer to when the new thicker belts will be available you will make me a lot happier. I would also love to PM or talk to someone about my other issues and dissatisfaction with this mower.