These little lamps with the phillips led bulbs are a great piece of kit.
I use them mainly to light bands in small venues, often combined with a few basic Led pars. They are a lot brighter than expected and surprisingly hardy (one of mine has survived a mosh pit encounter with a flying bassist while attached to a drum kit, and the drum kit came off worse!).
Being so small and light they can be fixed to a variety of places on the stage, where a larger lamp would not be practical. Also as they are so pretty, I am quite happy having them on show.
I was initially rather hesitant about the filter holders, they are not quite as pretty and a bit roughly made, but they do the job and actually add to the strength of the lamp.
The only con really is that the cable is a bit short for using them as a stand alone, which means I do have to play around with extension leads a lot.