To me it is no different than owning a digital multimeter or caliper.
It is just another tool in the tool box.
And when comparing notes with others, it is a good foundation to start from if the measurements you are taking are accurate, regardless of additional means taken to get to the final result.
As for the double bearing mod, it will cost all of $12-$15 to do and is worth every penny IMHO.
As you will find out, you can't really rock the bed plate side to side because of the linked lead screws, but front to rear is positively sloppy without doing something of this sort.
Others have run quad lead screws (linked of course), changed to 12mm guide rods, or even installed ball slides to solve this issue.
However in the end double bearings on the 8mm rods seems to work well enough.