I have a Dirt Devil hand held model with a beater bar on it. I have used it for over 20 years on Simonis 860 cloth and it is fabulous. The beater bar sweeps up all the chalk from the cloth. Removing the chalk from the cloth provides the best action between the cue ball and the cloth. Too much chalk on the cloth is like trying to run in the sand.
Be careful of beater bars or strong suction. Here's what Simonis has to say on their website (ignore the X-! portion if you wish):
"The cloth can be brushed, but to remove the chalk and talc powders, it can be cleaned with the new Simonis X-1® or it can be carefully vacuumed with a non-rotating brush-head attachment that does not allow for too much suction to be formed. Some small vacuums can pick up bowling balls, but this will only stretch the cloth on the table and possibly harm the grouting of the slates as well. You should test your vacuum and brush attachment off of the table first to make certain that it is not going to damage the play surface. Less is more in this department. After all, you are trying to remove a fine powder from a smooth cloth, so don't overdo it. The Simonis X-1®, is a new device that will allow you to keep your cloth in great playing condition and extent the cloth's life.
The cloth can also be wiped with a damp (not wet) clean towel. This should only be done after the table has been vacuumed otherwise the dampness may cause the chalk dust to clump together (think of it as adding water to dry clay). Once the dampness has evaporated, a quick brushing is all you will need before playing as moisture will cause the fibers in the cloth to stand up and a quick brushing will smooth things out."