Stephen,
Well for time being, I will stick with the Dewalt 611 to get going with X-Carve despite of some odds reveal by some users. To my knowledge Inventables is providing a rail reinforcement (part of an update) for machine purchase recently. I understand as far as Inventables are concern, the X-carve being an open source system, everyone can add whatever they fill to better the machine. I do assume that the Inventables engineering team must take advantage of several improvement and suggestions made by users over the time. Considering the cost of the X-carve, it is not a $40,0000 piece of equipment, so I will do of what I can with the unit and try to get the best out of it.
Thanks for your comments…