In reality the savings aren't as good as they'd like you to think- yes you get a brighter light with less wattage so it's a good thing, but the actual savings are negligible (like 100.00 a year).
I like the energy saving bulbs, however, because they don't get hot (safety factor) like normal light bulbs of say 100 watts, 60 watts, or even 40 watts (refrigerator bulbs, lava lamps etc...).
If you find the right ones with the "natural light" color it's a much brighter, rather clearer- i.e. not yellow or white against the contrast of your room, but rather closer to daylight feel without the UV rays...
I bought a lamp with one of these (and have yet to find another one like it) that is 25 watts but brighter than a 100 watt light bulb and again doesn't get super hot (I have a kid on the way so safety is entering more so into my consciousness)