imo, you are speaking from ignorance.

*the cost differential is not high if you get last years model on sale.
*the cylinders on mid-level SLX brakes have an XT heritage that affords superior actuation and adjustability in comparison to the designed for cheapness m395s (the m575s also have little heritage from XT and frankly suck even worse than the m395s).
*the slx has the one-finger modulation and power that made recent XT and XTR vintages such popular brakes.
*ice tech is not hype and really does improve wear and performance on descents.
*the slx allows the use of sintered and metal pads which markedly improve longevity in wetter/colder climates. (m395 rotors are not qualified for metallic or semi-metallic pads).