I sent my 550B back for the same reason you mention i.e. nothing wrong, just needed a "proper" clean up. Read the return procedures carefully as you pretty much have to take eveytghing off (handle, primer assembly etc) and basically forward a stripped down unit. In my note to them, I asked for them to upgrade my press to a 550C which really only entails the addition of grease fittings at necessary lubing points. The turn around was excellent < two weeks for sending out and having it back. Additionally, you could not tell the difference from a brand spanking new unit. They do an excellent job in communicating and in my case the technician who did the work called me personally to discuss his progress and anything special he may or may not needed to replace. Bottom Line: Well worth the expense to have them give your press the "love" as you noted. Only other comment in my case was I had the original box the 550 came in but because you strip every off, I ended sending in a much smaller box I obtained and saved considerably on shipping. Hope this information helps in your decision.