I'm looking at Raymarine and Garmin MFDs. Leaning towards Axiom 9 or 12. There is an abundance of remanufactured units being sold for a highly attractive ~$1k off. The only downside of at least Raymarine is you can't apply for their free 3 year upgrade from standard 2 year warranty. But I'm highly skeptical of why there are so many remanufactured units out there. Every vendor has them and it seems there is not a small supply. How could such a large number be sent back to be so called remanufactured? Are there that many being installed, and then shipped back due to issues?