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If you haven't used a belt sander, there is a learning curve. Hand held belt sanders are heavy tools, and for the most part are a two handed tool. Using one takes some experience as it's similar to using a circular (rotating) floor buffer, in that there is a sweet spot on the pad that allows good control. With a floor buffer, that sweet spot will allow you to control that machine with one hand. Off that spot, the machine will carry you to the closest wall. Once you get familiar with the "feel" of the belt sander, control is more of just guiding the tool, and letting its weight work for you.
It has some grab due to the belt abrading, which accounts for a "pull" from the tool, that requires some resistance to control it. Using one for a whole day could make your wrist, arms, and some back muscles a bit sore.
They are very aggressive, and can do a lot of damage pretty quick. Care has to be taken as a common problem are dents or dimples in the surface from the rollers. You may not see them until you quit sanding.
While Makita makes some good tools, I've had a few of their belt sanders and wouldn't buy another. I would recommend a PC 360 VS. It's a bit more pricey, but IMO, one well made industrial quality tool. That's my story and I'm stickin' to it.
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