Scott-oilers on 'Sally' SRX600 twin-shock and 'The Boy' Bros400. Both units hidden away in the tailpiece below and behind the seat at the back of the tail light. Vacuum taken from the inlet on both bikes. Work well, can be adjusted so that the rear of the bike doesn't become a slick and are economical. Chainsaw chain oil, used to use Scott-oiler oil but used to fling off more than chainsaw chain oil. Wipe the chains down with a cotton rag or wool sock to remove the build up of cr*p on the side plates. Both chains are 'X'ring type.
Purchased the 'Loobman' oilers from Mart's offer, only used one and it works fine with the chainsaw chain oil. Bit of a b*gger to fit so that it is handy to give the bottle a squeeze when required, yet be tucked away.
'The Mono' runs without a chain oiler, again 'X'ring type. Chainsaw chain oil applied with an old tooth brush dipped in the oil and a small amount of locksmith's dry graphite flakes added. Less fling and luverly and slippery. Seems to be working well, same wipe down and apply after ~500 miles.
The Duke 450 with a 428 rather than the original 530 size chain and no 'X'rings, as there isn't enough room in the cases to fit such a chain, will test the chainsaw chain oil and graphite mix applied with a toothbrush. I may try and find room for a 'Lubeman', time will tell.
Good health and don't let your chain run dry; a clarty rear could mean more mpg or a smoother ride!

Bill