I have a Paceman machine I set up in the garden. 5 minute job, or less, to get the machine out and an extension cable unfurled.
I have a concrete area (perhaps 30 feet by 10 feet wide) which I bat on. As the max speed is only 60mph I tend to have the machine set around 15-18 yards away to increase the apparent speed a little. Because it is set up close, the balls are inevitably good length/ full. I use it as a way to get my stance right, get my feet moving and my eye in. I don't try to bat as I would in a match and smack a half volley; I just flow through the stroke. This is a fun way to spend 30-60 minutes or or so and get my eye in. I typically face around 60 ish balls in half an hour, using the auto feeder, then collecting the balls up to re-fill.
When my kids use it, they do tend to smack the ball, although I have it set up that it generally stays in the garden (ie close to a wall on the offside, more space on the legside)
I am planning to dig out a net (say 12 yards by 3) in part of my lawn, going down perhaps 3-4 inches, backfill it with mill waste, compact it then get a coir mat to roll out. I will then get a net that can stay there permanently. Unfortunately, I have too many other jobs on at the moment to get around to this. With a net in place, there will be more freedom of stroke.
David