By and large they are easy to service, the old ones have very few o-rings so don't tend to leak very often.
No A/T fitted on any of the examples I have got.
I have a brass cylinder Huntsman 'Low', three Huntsman FTR Mk1's (didn't intend to have three of them but when offered the second and third examples at very little money it seemed rude not too), a Huntsman Mk2, an LR90 and yesterday I finally picked up a model 2000 serial number 9.
I have had others in the past including a Midas FTR, a Harrier, a couple of CR-94's, a CR-97 and an Air Ranger, but I particularly like the ones I have now.
These are the ones I currently have pictures of:
View attachment 957271Huntsman Low
View attachment 957273FTR Mk1 (a)
View attachment 957274Huntsman FTR MK1 (b)
View attachment 957275LR90