I guess it partly depends on if you play at different sites. I try to avoid getting what I consider novelty guns now, which i'd class the Breacher as(so I sold it), because even in CQB some sites seem to promote massive volumes of fire which it just can't counter effectively. To me it all comes down to whether you are going to be really limited as to where you can use it to the point you put yourself at a notable disadvantage.
The biggest issue for me is if I run guns that use different magazines or use something like a MOLLE belt which completely blocks my duty belt that my holster is mounted to. To me the best solution is to have multiple loadouts as opposed to compromising on how I mount kit. The upside is I can do things like run a MOLLE belt setup which holds a spare LMG mag and is very lightweight, even with the hydration pouch attached. Downside is it costs money and takes up room