The Cigar Oasis is great for those that regularly need to add humidity to the environment. I would say they are more useful in the northern climates where the air is much drier most of the year and moisture is lost at a considerable rate when repeatedly getting into the humidor.
The thing to remember about the Oasis is that it is a one-way humidification device. It can do nothing to pull moisture out of the air if the humidity gets too high, it just pumps it out if it's too low.
So to answer your question directly, I would say it works better with beads than without. The beads help to control smaller humidity shifts and the Oasis does a good job of recharging the system once it has lost enough moisture that the beads cannot operate correctly. Again, this assumes you deal mostly with a problem of keeping humidity UP, not having too much of it.