How permanent are your inkjet prints? Depends on the type of ink and media used. But surprisingly, OEM cartridges such as HP are vastly superior to aftermarket inks. (refillable or not). Here is the report (pdf). This means that if you want your prints to last more than a few years, you should definitely use inks from the manufacturer; especially if it's a HP printer. If you don't care about your vacation snapshots lasting decades, then by all means, use the after-market, cheaper inks.