They just spent a day sandblasting my 50 year-old concrete walkway to prepare it for stain and sealer. I talked with 4 companies before choosing M9. M9 offered a fair price and Ross is clearly very knowledgeable regarding blasting stuff with sand. They showed up on time, and all work was performed as described. Even though the water keeps down the dust, there is still a lot of cleanup when you spray a few hundred pounds of sand via the dustless process. They did a very thorough job cleaning up. Long story short, I recommend that you talk to M9/Ross before deciding who to have blast your concrete/car/whatever else you need blasted.
Great service, friendly employee, job was done on time and within budget.