Newbie... just wanted to mention I've had pretty good luck w/ those bulbs actually. I recently picked two packs up at a local Petco. Didn't even know they existed. They were about $2.50 each, so I got 2 packs.
I have two tanks, a 75 gal & a 10 gal. Both have sand as the substrate and I have CO2 setup for both.
In just over a week (planted them last wed.) I now have 2 red lillies sprouting up, several stems from each that are about 1 in. long. There's 3 onion plants that have rooted well and are just barely sprouting leaves. Lastly, 2 mystery plants that have sprouted LONG thin stems/leaves that have seem to shot up overnight suddenly. About 6 inches.
So for $5, compared to just the price of 3 onion plants ($10-$12 each) and 2 lillies ($6-$8 each), already grown from my local tropics store, the bulbs are a HELL of alot cheaper. I don't even know what the 'mystery plants' are yet either. When they grow more I'm sure I'll be able to figure them out.