hi i'm using sepom ink system for 3 mths with my canon ip1600 and its doing fine. in fact all my collegues and friends are amazed by the quality and price.
anyway even if my printer spoils after a yr, its only $99 which costs less than 2 full sets of original refills.
also , the ip1600 print heads are on the cartridge so if the print heads spoil, just buy a set of original refil cartridges.
i've gotten 2 more systems and 2 printers from sepom (total $230/set) for my office and church. so far both can print well with no streaks, although one leaks ink a bit.
my conclusion is that sepom CISS is pretty reliable though i would suggest you test out the printer and ciss before you accept the set. the yellow ink from some of their refills seem rather dull. but overall i'm quite pleased with my purchases.
last year sep, i bought ciss from inkstation for $150. really regret man. i had problems installing, then had to send it down and wait for 3 hrs. the refilling is a pain coz it is on the side not the top (unlike sepom). 7mths later, the ink system didn't work. i bought a whole set of new cartridges only to discover the problem was that the ink from the ciss leaked and spoilt my printer. oh well. at least my printer was a very old one.
based on my experience, i would advise to buy sepom and not inkstation.