in the uk cyklons are the reg of choice for sidemount diving. i have used apeks regs for 2 years in uk caves but just bought steel bodied cyklons as they are more suitable to the enviroment i dive in. i think most of the fellas in my section use cyklons for sidemount and they take them in to some grim conditions in the pursuit of cave exploration.
as for servicing i had mine done by poseidon uk as the poseidon service tech in a dive shop told me to when he remembred i dived in an overhead enviroment !!!!!!
oops, sorry.... But I still like it.
I was scared one would strip the thread as it was peeling off the plastic. Went to the shop and polished down the burrs and relieved the first two
or three threads and they went on smoothly.
Gauge says 4300 PSI??? That's what I call Doin' It Right!