@Arrandan... when you build your own cases the rails & inserts are about the most expensive thing... cost of 1u rails = cost of 3u rails... extra case materials & power can be close to 0...
as for the quadratt - I'd rather have a happy nerding 3*mia or mutable shades... or even a triplatt!!! anyday... both 6hp... that's 5-6% of the row - quadratt is 28hp... that's 26% of the row... and that's the most compelling 1u module in lots of ways!!!
& utilities are the "real" modules just as much as vcos and lfos and filters!!!!
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities