I like them. The bits are nice because they're interchangable and double-sided. I also really like that they are made out of tool steel instead of stainless so they have hardness more like a good screwdriver. And, in the event you do strip a driver, you can just replace it.
The downsides of course are that they are short, and that you have to buy them from LM. If you find a good place though, they arent too expensive. And I've found that because I run into situations where there are recessed screws AND situations where I need a short 90 degree driver, it's about 50/50 IMO as to wether short or long is more useful.
All that said, I also like the "regular" drivers and know that they have benefits as well...