I bought my xt276 in 2012, before the 300 was available but it fits my needs to a 'T'.
Also, other than a few minor adjustments (zero problems with any major appliance or system) and making my own custom additions ~ more than pleased with my unit and consider it a great value for the amount invested.
There are a few here who seem to have problems on a regular basis ~ something I have been blessed NOT to have.
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.