.....it really depends on your own situation and environment.
Digtial domain cables, unless they are very long runs, probably will not benefit much from upgrade.
Analog cabling, be it interconnects for audio or video or speaker wire, can benefit
from a step up from 'zip-cord & coat-hangers'...particularly if they have to span long runs. Monster is a particularly poor brand, namely because many of their plugs are far too tight....i've pulled sockets out of compoents with Monster junk. To me, quality plugs on the IC's that are 'just right' for fit and won't loosen over time or repeated use can be pretty much most of the issue.....the same goes for good lockable bananas on speaker cable lengths. A good route to go are through the many online vendors that will build you custom cables with high quality components like Belden coax and Canare plugs at a fraction of the price that a 'cable boutique' would charge you for their latest smoke&mirrors brand. That's what iv'e done with IC's and i use 4 strand twisted speaker cabling due to some very long runs....just as some preventative maintainance
against picking up hums etc on 60' runs.
Integra Research RDC-7.1, Bryston 9B-SST, NHT vt2, vs2 & sw2, Sony 65XBR10w, Moto 6416iii, PS3-250, Sony BDP-s550