I also recommend a honing rod; a good ceramic one will run you 40 dollars or so. Takes some skill to use, but it will change your life. Your blades need to be realigned.
It differs from a sharpener in that a sharpener takes material off the knife. You should hone every few weeks; sharpening should come once or twice a year. Sharpening too frequently will a noticeable reduction in the knife's physical size relatively quickly (not that it still wont cut).
Get a sharpening stone, brand doesn't matter imo. I have one with 1000 grid for rough sharpening and 6000 grid for making it really sharp. It does require some learning tho.
As other comments have alluded to, a sharpening stone is a far better investment and only takes a half hour to learn.
Even if you do a bad job it'll likely be a better result and better for your knives. Most sharpeners absolutely destroy knives and take far too much material off.