HVAC options for apartments/condos

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Have any of you used single package HVAC (thru the wall) for your builds or rehabs? 

I'm looking for more info so far I've come accross 3 companies: MagicPak, Skymark, and FirstCo that makes these types of units where there is a single HVAC inside of the unit - typically in a closet style box. 

I want to know who has buildings with any of these units or other units that I should consider. At this point they will be electric only/heat pump. No gas or water. 

Just want to know how maintenance and reliability has been for these kinds of units and any pros/cons.

Thanks!