The two tours we booked were well organized. Our guide/driver kept us informed of arrival times and was friendly and helpful.
We enjoyed the wineries we visited finding the variety interesting. The tour guides at the wineries were extremely knowledgeable and welcoming.
One tip I would offer is that while your fee covers everything, it does not include leaving a tip at lunch. We wish we had known so we could have brought some local currency to use for that purpose.
Also, these are longish days with a lot of wine, obviously. One day I brought a small bottle of water with me. I would encourage the tour operator to keep a small cooler in the vehicle with water bottles available. It would be a nice convenience.
All in all I would recommend this company for the convenience of having someone organize your visit to the wineries regions in Mendoza, Argentina. They clearly have built relationships with a wide range of interesting wineries and get you to places you might not find on your own.