A few months ago I bought RLS chain oiler which is produced from Slovenian compay. Owner of this company is also registered on XRV and Varadero forum.

http://www.rls-oiler.com/english.html

Anyway after few 1000km in all conditions I must say that I'm realy impresed in positive way. Complete system is realy quality made, all components are made from aluminium and stainless steel, no plastic parts at all
Consumption of oil is not too big and on my opinion is it possible to made at least 8.000km before adding oil.
Flow it's easy adyustable with regulator valve which means reduced flip off efect.
And what is most important no more spraying the chain on longer trips

You can find pictures of mounting on @ on their website
http://www.rls-oiler.com/monta_a_en.html

I received 5 year full waranty and realy good support when I had some problems with mounting.

Realy recomended.