Mills MRA two types of different brand ?

The old Mills have a slightly better top end ,due to the silver platedcaps.
the newer ones are by no means dull just less promenant in the upper treble 
the new ones seem a bit fuller ,rounder in the Bass like a tube amp 
and nice full mids depending what driver  you are using  and need to give them 
a solid 50-100 hours from. Starting to open to fully settled me .
ifyou want better still the Path Audio. Are excellent  at $30 a pop a bit steep .
that being said the French company beginning with a L  want over $100 each 
they could be slightly better still ,but I will never know . I refuse to pay that for a single resistor. Like Duelund cast they maybe fantastic but Iwoukd never spend that much $$. I had their Jam caps same everything except for the compressed 
cardboard case , which does make it better ,but maybe 5-7% and 2x + the cost.
and hopefully your cablesand electronics are up to the task, or that is a Ton of cash spent for little return. 

Not totally True ,even before 2011 Mills had black and brown finishes which I have personally used both the same quality. Jeff at Sonic craft states this on the website . The 2011 to present say Mexico and for whatever reason are not quite as precise ,possibly quality of Copper, and no longer using Silver end caps like originals which. Suspect.
when using Tantalum resistors when AN started making with brass ,not as good as silver end caps , that’s what I got out of company changing  materials 
less quality refinement. Just buy NOS from Sonic craft,or Michael Percy.

For Loudspeakers Path Audio best anything including Duelund ,Mills or anything in between $30 each but less then 1% distortion  I only use the in my speakers now .