The unstoppers proved to be both unreliable and unethical.
They were scheduled to come out on a Friday and simply said “sorry, we’ll be out next week.”
Of greater concern was the work they did. They came to my home to fix a hot water heater (check for a leak). They determined that there was no leak. BUT, after they left, there was no hot water. While they were there, they made several changes / adjustments to the unit. When I called them, they lied, saying that they never touched the unit. They simply refused to come back to fix what they broke.
Do yourself a favor: Find another plumber!!!