Haven't heard of them, but I just started up a new tank with dry rock from reefcleaners and it is some great rock and prices can't be beat. It took 2 weeks to cycle with Dr Tims One and Only and the Ammonia that they sell. GL.
I have not in the past but I am going to be in the next week or so. In the past I have placed small orders from Live Aquaria and Premium Aquatics and received nice rock. I am getting ready to buy some from all 3 venders at the same time to compare and will start a thread with photos as soon as I have it.