Someone brought up the old ETS being top heavy. I actually think the EC is top heavy in comparison. If you take the old ETS connected to a hose from a boom arm and put it on your work, it will sit flat by itself. The EC will not - the weight of the hose causes it to tilt. Id actually rather have some weight to help with the sanding. The EC might be more aggressive, which would explain its, in my opinion, excessive vibration and pull. We tend to stick with what works. Figured the EC would be an improvement or same when we bought, but not worse. Again, these are our requirements. If I was doing weekend woodworking projects I might like a more aggressive sander. We run most of our stuff through a wide belt sander first, so only need the ETS for the final sanding. All our frames and doors come out of wide belt very smooth and clean, so it's just to take things down to 180 or 220. But again, our requirements - you aren't going to see a wide belt in most home shops as they are three phase 30 hp motors - so you might want the pep to smooth out your glue ups etc. I just read somewhere else in this forum that they are releasing the old ETS again at the end of the summer, once they get all the Pro-5s out. This, I think tells you something - that Festool knows the EC is a bit of a dog, otherwise why have two 5" RO disc sanders?