I certainly use them. But then again, I have them for my business not for hobby sewing. It makes things much, much easier than a typical sewing machine in some cases, others you about break even in effort as it really depends on the system. My work machines often aren't set up for thinner materials so I have to use a walking foot to compensate.
I've got a few (3 or 4) extra commercial/industrial sewing machines laying around. They all still work fine (2 practically new) but didn't work on 1" tubular webbing in 3 layers with tight bartacks for my slackline business.
They are all normal style movable systems (i.e. not permanently table mounted). Some have external drive motors that mount to the sewing machines base, others are internal motors like a normal sewing machine. I think I still have the decorative cams and walking foot attachments for one or two.
If anyone is actually interested let me know and I'll take some photos and make a posting in the gear swap area.