I am an Olfa fan...I have had the same small one I started with in the mid '80s and bigger ones I have added along the way. That being said, I am going to the AQS Grand Rapid show this week with a Martelli one on my list. I read it does not warp. I am looking for one that will travel better. I have been known to run back out the car to schlep in my mat even if I am not quilting! lol