Hi Sensebellum,
For the first four months of ownership my S5 behaved very well. Since that time, it's been one thing after another. I had an extrusion issue where the material flowed back up into the print head, which opened the print head door during printing. Bad form. Ultimaker "bent the print head" back into shape, which was a bit of a red flag for me, but it printed fine. Until it didn't. My most recent issues have been communication error with the print cores (ER34), flow sensor issue (ER65), and I2C communication error (ER35). I'm presently in conversations with my dealer as to how to deal with this situation. Out of almost 12 months (i.e. the warranty period), my S5 Pro Bundle has been down at least two months for repairs. I've started multi-day print jobs that ended with one of these errors in 5 minutes on some occasions, 36 hours in others. Right now, it's in a hard-down situation and is back at the dealer.
One other issue I'll call out here is with the material station. While the concept is brilliant, my experience with my particular setup has been underwhelming. The material station has six bays, but if I place a spool of material to an adjacent bay with material in it, I just get a "?". Apparently proximity of multiple RFID tags in adjacent bays (sometimes more than just the adjacent bay) cause an issue of reading good information. Sigh.
If I had a do-over, would I buy the same printer? Honestly, I'm not sure. I probably would look at other manufacturers a lot more closely. I bought the Ultimaker brand promise of reliability, quality printing, etc. I got the quality printing. When it works, the quality of its prints are excellent. When it works. I seem to have gotten a unit minus the reliability part of the brand promise.
Regards,
Gene