UPDATE:
CFS700 has been running for almost a month now(using the configuration of suggested flat-washers/rubber washers + my configuration of /U/V intake tube wrapped with bonded filter pad surrounded by potscrubbers), no problems/leaks.
Would I recommend? NOT TO A PERSON NEW TO AQUARIUMS/CANISTER FILTERS.
I find it way more often that people are WAAAAY too "HEAVY HANDED" to use something that may take a bit of "TLC" to make work safely/correctly, ESPECIALLY WHERE MODIFICATIONS MAY BE RECOMMENDED.
I'm NOT an EXPERT, BUT I've been doing this for over 25 years, so I have a bit of a "seasoned" hand tightening knobs, lubricating seals, etc. Most people that are just starting out DO have HEAVY HANDS however, and end up OVER-TIGHTENING knobs(which with the cheapness of the plastics/materials on these CFS Canisters causes cracking).
TREAD WITH CARE, YMMV.....
P.S. I still have the 1200/14i in the box unopened, so I'll get to that when I get to it or need it...