As has been said in the thread already:
They CAN leak - do a search and read the tails of woe (other than on their site) and they can be released by a crazy who has it in for you sans tools. You may not even know what you've done wrong and lose a motor over it.
Yes, they are designed well and will operate satisfactorily in secure situations.
However, the main point is made well in the Fumoto promotional video where the chap does a full system drain with his bare hands. Try that with some road rage maniac who will follow you until you park and leave the vehicle unattended. Then drive 200 yards down the road and you have a dead motor. I do not like that at all.
At least with a set-screw they need to find a spanner. If I did any more off road driving than I already do I'd be cross-drilling and wiring the thing as well. If I feel a need to make or buy security nuts for my driving lights I also feel the need to secure my oil.
In my view - and this is my insignificant little view (and I am the only one who gives a darn about it), they are too easy to damage off road on these engines. They are right on the bottom of the sump, close enough to centre - not well off to the side or anywhere that might afford some degree of protection. For a car used off-road car and on public carriageways give me a washer any day.
I'm not averse to modifications to make work flow better on this car and have made numerous changes to this end but the Fumoto valve is one I just will not do but who cares what I think except me.
As a job it is not that hard in the first place even gimped and I could never understand a hand sufficiently lacking in sensitivity to strip these threads. They are well formed from the get-go.
My work notes and side-bars in my manuals list the particular tools for a given job that make it flow more easily - even sump plug sizes in AF - as well making setup and tool layout extremely logical and sequential.
This is an add-on that is not needed IMHO.
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