I've only owned Reos for around 6 months, but from my experience with them they are the epitome of the acronym KISS. They have been no fuss no muss in every way to keep them as new with very little easy peasy maintenance. They are like night an day different from my previous favorite mods and their toppers that I still consider really great mods... but ones that "had to be" completely disassembled, scrubbed and washed, dried and reassembled once a week to keep them hitting hard. Individually not that big of a deal... but having 10 of them and their toppers mostly in daily use was a very big deal. Maintenance day was... a day.
I've never had a leak in my Reos. The closest they come to a bath is using a blunt tip syringe up through the tube to flush them and the 510's out occasionally, flush bottles/caps/o-rings occasionally, a wipe inside and out with a slightly damp cloth followed by a soft cloth dry/buff occasionally, clean the 510's and contacts with a Q-Tip and PGA occasionally, retreat them with G100L occasionally. The operative word... occasionally. In use I mop up any joose that escapes atty air intakes when squonking or spatters from firing the atty, a soft detail brush to "dust off" anything else as needed. I have not waxed or coated any of my metal Reos, but they have been wiped down with a Cape Cod Cloth a couple of times. It is on my list to pick up a spray can of high temp stain clear for the two new "veins" that so far have not darkened at all. Not sure yet if I'll use it though, not sure if it would have to be renewed often so may just stay with the CCC's. I'm not interested in a Reo that "sheds". The Woodvil's get similar maintenance (except for the CCC's anywhere other than the brass catch cups), plus they got the initial treatment of Howards Sun Shield inside and out once. They have not needed it again since, but then my woodies are never in direct sunlight (they only go outside when I go out to run errands or for walks in the wee hours of the night). My atty's are each dedicated to a specific joose, most of them running RxW now, so they just don't need much maintenance either. They get dry burned as needed, flushed occasionally, a short run in my UC if changed to a different joose. I haven't collected enough used bottles/caps/o-ring yet to run them in the UC.
Since around midnight I've had 7 Reos in use for today/tonight and beyond... 3 LPG's, a VVG and 3 Woodies. As easy as it gets vaping when I know none of them will need anything at all other than joose bottles refilled, maybe fresh batts.
but yes, somebody posted here a while back with pics of a run over REO, functioning just dandy.
