I haven't used the process personally, but have hired a commercial blaster to do the manlifts, at a rental place where I was the shop foreman. The pro's and con's would vary with what your doing and where. It's going to make a mess either wet or dry. Going to get tracked into your home if it's a driveway situation. If done wet, it works very well at keeping the dust down. The water pressure removes the grease and gunk while the media takes care of the rust scale and old paint. But it starts to surface rust in a matter of minutes. Cost wise, no more than if you try it yourself, most likely less. And, if you figure in the clean up process, with disposal of the left overs, hiring it out looks better all the time. We used to have concrete, plaster compound, paint overspray, glazing glue, sealers and an bunch of other stuff stuck to the platforms and railings of the lifts. It would rip that stuff off, and leave a nice surface. I'm all for the process, it will, and can do a great job, but the crappy part of it all, what ends up in your driveway, makes it less desirable. The earlier advise from Itoldyouso, is pretty much right on the money.