Seeking Advice on Refill Kits

I spent $80 today buying cartridges for my Lexmark Z65 printer. So shocked was I at the prices that if I didn't really need it right away, I would have tried to purchase via Ebay. Wondering, has anyone used the refill kits? Looks like the process might be a bit messy, but thinking about trying on the next go around as they are more economical.