Pros: bright, well-protected
Cons: white light, hums, not immediately bright
Huddler hooked me up with one of these bulbs as an Action Team member. I got the one pictured furthest to the right, which has an ovular dome surrounding the bulb. They normally cost around $11-14.
One issue with this bulb is that it often takes 10-15 seconds to reach full brightness. I've heard that this is sometimes the case with CFLs, but all the ones I've previously used are bright almost immediately. Another odd feature is that this bulb has an audible hum. That's a feature you normally expect from an LED, which have fans to keep them cool, but not normal for a CFL. It's not loud, but it is audible. And finally, the light from the bulb is quite white, kind of reminiscent of fluorescent tubes. It's a bit on the harsh side, but you get used to it. Maybe I'm just used to bulbs with warmer light.
One nice feature about this bulb is the dome around it. This is probably to diffuse the light around the room, but I think it would also keep the filament from breaking if you dropped it. Some people are concerned about the mercury contained in CFLs, and this is one good solution for that fear. And it's about the same size as a standard spiral CFL.
So overall it's an okay bulb. Not my favorite, and I wouldn't pay $12 for it.