I cannot help re upgrading the unit but its obvious that the X5 is fine for light - medium use but is not likely to be up to the task for heavy duty work on a daily basis. I'd be very interested to hear further reports from PrairieRose.
Cptken ... I'm not looking at the manual but if I remember rightly you can adjust the response reset auto number to reset to the number of your choosing. Its in the setup menu.
“Give a man a fire and he's warm for a day, but set fire to him and he's warm for the rest of his life.” Terry Pratchett