I have two of these mobile bases and an HTC mobile base. I prefer the HTC because the foot lever on the Delta protrudes into the shop walking area and causes a tripping hazard. I've tripped over them many times and tehy get in the way when I use the tools. The foot actuated operation is nice(although it tips the tool at angle uncomfortably far from vertical) but in my small shop, I need all the real estate I can get. I plan to replace the Deltas with HTCs when I can afford it. The HTC base uses two locking knobs to keep the wheels from moving while the tool is in use. It's less convenient than a foot lever, but it works well.