Is not worth in my opinion. Efficiency ends up nearly the same, you loose warranty for you card, the card runs very hot @100% fan, and it use to much power for the riser on long term, you must pay for this mod - extend your payback time for months.
That's why RedPanda Mining said the thermal pads on A2000 need to be replaced with high grade ones like Artic or Gelid extreme thermal pad after the Mod is done, I've watched a few videos about this on Youtube and they are getting good temperature after the Mod.