I've had two and one of them I installed myself. I really like them but just never seem to justify to put them on my boat now. Granted I wish I had the money to do it. I think it can really show you alot of information "live".
The install I did on my MACK E9 included all the pressure snubbers and sensors. I think I added something like 8 or 10 fuel connections which made me think about doing it again.
I have had friends that could never get them to work on certain installations, they went back and forth to no avail. These people were professionals too, so I have heard of that too. Some people put alot of money changing all their fuel lines out, full flow fittings etc to them, to get them to work. Its not a simple plug and play, although you can get lucky.
BTW Mine were always the 5500 Cruisemaster.