Danny...As Tom Selleck said in the movie, Quigley Down Under..."didn't say I didn't know how to use one. I said I don't have any use for them". I've had hydraulic clutch actuators in several of my "project cars" and, as you said, I will in the next one as well. They are a very expedient way of getting the job done in a pretty good way but are more finicky. Especially when slight leaks occur. Many people, with limited experience, don't understand some of the critical aspects of how they work. Even though the system seems simple. One example comes to mind regarding piston/cylinder sizing of both Mstr.Cyl and Slave. Another is making sure the fluid lines are not in contact with severe heat sources such as exhaust pipes. In one system, the owner didn't remove the residual valve from the Master cylinder. Another one, the owner had too much angle on the push rod in the full extension position, limiting the release force and travel distance. Another, the slave was too far from the release lever and ran out of travel before the clutch was released. Sometimes it's just better to keep it simple if possible. As you said, you've had your fair share, and so have I, of clutch problems and I have concluded that a good solid mechanical linkage set-up is pretty fool proof for a long time. How it works is also easily understood by nearly everyone. In the end.....There is a place for hydraulic clutch systems but personally, I wish it were not so.
Speaking of Subaru Clutches. How do they compare to the HD units we use on a VW ? The one on my engine looks about the same but I'm not sure. It is made by Subaru and I believe it's used in a Subaru Forester..................Bruce