I used one last week, but I was using a brand new driver, so I can't testify to the accuracy there. But my Brother's drives were going about 220 and had a slice just like real life golf. So i would say they are fairly accurate. I did have to club down one club for my irons. they all were about 10-15 yards long for me.
The machine said my drives were consistently in the 280 yd range, off the heel of the club. around 300 when struck on center. Im hoping those results are accurate but won't know for sure until I get out on a course.
It was great though, even if my results don't carry over, to be able to swing full and hit a ball. Wish I found this place in december. I was amazed that you could work the ball left or right on the simulator, didn't think it would be that accurate in that respect, but was pleasantly surprised.
Putting was terrible, and I couldnt hit my lob wedge because the ball would hit the ceiling in front of the screen and it wouldnt pick up the ball.
I enjoyed the driving range feature the best really, seeing all the info for my swing like path, speed, ball speed, trajectory, contact on face, face angle on impact etc etc... was the first time I could actually see that my path was outside in, causing my slice off the tee.... I knew I had that problem, but was amazing to actually see it.