The betta bulbs? I've had good luck with them but thats actually rare.. usually the bulbs are dead or don't sprout. They're cheap so worth a try.. just make sure you sprout them in a separate bowl. Once they start to sprout put them in the tank but don't bury them or the bulb will rot. IMO they're a little more trouble than their worth and you still have to wait for them to get established before they really look nice.
Heres pics of my apons from betta bulbs.. two different plants from the same package. (These are young plants.. eventually they'll get going and spread out more)
(in the second pic the darker plant is silk.. the apon is the yellowish looking on)