I have a pair just like that and really like them. They really help bring out some detail that would normally be shadowed in my dark basement.
I like that they can be plugged in or battery too.
I didn't buy the battery packs either yet, but they would be very handy for outdoors. Its hard to believe that they can make these things so cheap and they are really good quality and very well built.
Another great thing is that they are cool running, 'old school now' constant studio lighting was very
very hot!