The 245 would be the Magnum line and not the MX line.  The MX units were the first units of the newer body style with the CAPS system.  We had a 240 that we bought used that was a miserable nightmare when it came to hydraulics and electronics.  I don't think we ever had everything working correct on that tractor.  In 08 we traded it for a new 2007 Magnum 245.  The 245 has been rock solid. It has 2,400 hours on it and I has only had one hydraulic remote potentiometer replaced along with regular service.  Its a good strong tractor and lugs good as well.  We just had it Ekotuned this fall too but have not had a chance to try it out since then.