i had a cx back in 95,sold it in 2000,just had the unit back over xmas to service it for the guy,still looking good,origional vac,second pump,& a new plug.
extracta portables are excellent units,had a cheyenne from prochem that too was a excellent unit.never had a comanche sorry.
ps
go for a unit with 2 3 stage vacs.dont forget the HEAT.
EXTRACTAS are built in.