This model has been basically unchanged for decades- in fact my first experience with it was in high-school shop class 40+ years ago.  I just purchased my 3rd or 4th  - the others are all out on jobsites somewhere leaving me without a personal sander to use, so I bought another one today. I give it 5 stars because it's a  rugged, professional tool that should last for decades. It does exactly what is supposed to do - it spins sanding belts letting you grind away at 'whatever'.  Pro features include a lever that releases the belt, making changes a snap, a very good tracking adjustment, a platen that is easy to replace when needed,and a fairly long cord (3 prong - this is a metal housed tool that does require grounding).  Now that I've built it up quite a bit, let me tell you some bug-a-boos that have always been part of the Porter-Cable sanding experience...  As others have mentioned - the dust port location on top is a real nuisance. The bag is always in the way, and remove it at your peril- you will be eating/breathing a direct stream of dust.  Older models had a metal elbow that diverted the dust to the side - but this model comes with only the bag - and the bag opening has way too much "slop" so you will still wind up eating/wearing dust.  Most pros cobble it up with some duct tape or cable ties  - and/or take it off altogether and cobble on some kind of pipe diverter.  The other "quirk" of this model is the shape - it is relatively difficult to mount the unit upside down for bench sanding of small parts,  sharpening chisels and plane irons, etc.  Note that I said "difficult" compared to the square Makita or other "modern" sanders.  Problem being those are also gutless toys by comparison.  So again, 'pro' users find ways to do it - they  build mounting jigs etc. to mount their porter-cable  sanders on a workbench.  If you search Google or YouTube you'll find plans for mounting jigs and so forth. Bottom line - go for it, if you need a good rugged (heavy-duty) pro belt sander - you won't be disappointed by this tool.