We had them install a very expensive stamped concrete on our driveway. A beautiful driveway initially that began spalling/flaking 5 months later in a couple of large sections. they came out to look and said it was caused by road salt, not their fault and there was nothing that could be done to fix the spalling. They recommended that we acid wash the whole driveway and reseal to protect it from further deterioration(after telling me the sealant should be good for at least 3 years or longer). My wife went out and repaired the spalling areas herself with a lot of hard work and it looks reasonably good for now. Get a written guarantee against spalling for one year with whoever you use.