I’ve used a HolePro X-200 adjustable hole cutter for years. I think they have changed the model number for this cutter now, but it is an 8-inch max diameter, two-blade cutter with a nice heavy duty plastic dust shield that uses a sealed bearing assembly in the shaft hole. I use this with my cordless 18V XRP hammerdrill with the side handle installed.
I upgraded it with their tungsten carbide cutters so I can use it for plaster, Hardiboard and fiber cement shingles as well. I also have the hole saw adapter arbor kit for it, so I can use the dust shield with my regular hole saws and my larger Greenlee RC light hole saws.
They now sell a vacuum adapter for the dust shield for RRP work, if that’s something you do.
HolePro Cutter 
