It is always daunting purchasing and refilling ink jet cartridges. I have it down to a fine art now. The secret is to refill them before they become empty. This ink is of good quality and well up for the job. I have not noticed any drawbacks using this ink, since the originals ran out well over half a dozen refills ago.
It represents excellent value, which you can literally see, especially once you have the experience to do refills in your sleep. Personally, I use a large box of latex gloves to do the refilling, rather than the blue plastic ones supplied with most ink refill kits. I can get better control over what is happening. I always leave the cartridges to recover after every refill. As it does take time for the pressure to equalise in the tanks.
I use the stainless steel draining board to work on (easy to clean and next to a water supply). Wash/clean everything as I proceed using nothing more than cold water from a running tap, including the gloves, to prevent ink cross contamination. Always Blot, never rub, the print head and allow time before printing, to allow the pressure to equalise in the tank(s), of around 12 hours (this saves countless wasting of ink/paper/time trying to remove 'blocked' inkjets).