I bought a used hospital grade, and it needed a complete overhaul 3 months after I bought it. The mom I bought it from used it for a couple months, but the motherboard went bad. It cost me, in the long run, way way more than had I just bought one new. I also was given a used pump and used it too (I know the mother extremely well) and wore it out, with just using it 1-2 times a day 3-4 days a week, in about 6 months. She had used it about the same, so 400 hours was what we got out of it. I had a Lansinoh, which is basically a PY, and used it for about 400 hours, over 2 kids, and it died completely.