Well i tihnk im the only person who does (or is going to) use it i have 8 boyz atm with like the twin shootas from bikes instead of arms etc and alot of old gorka morka bits from muties etc strapped to em to make em look cyborks.
The Reason most people dont is
a) you NEED a warboss so why have 2 HQ unless you got like a 2000+ war going on. (i.e. 1 warboss and one big old doc)
2) alot of cenarios say, for instants "1 hq and 2 troops" since you need the warboss you dont get the cyborks option
c) There are no cybork models so you gotta model your own which requires effort (and im part of the Ultima Online generation i.e. effort is too hard)
but i think cyborks are mad and im gonna use them at home rule games (where anything virtually goes) so hope i helped
Keep on fooling