I have not done the ones at Walgreens, but I have used recycled cartriges and refilled my own through other means. I don't care to do this but there is a great money savings. The only caveat....look at your printer's warranty. Many times using recycled cartridges or refilling with void your warranty. And even if your warranty is expired there are other risks, including a worn print head leaking all over your printer, desk etc. Doesn't happen often, but it can happen.
Just my 2 cents.