Nay - never tried them myself, but whenever people mention panels of led's they've seen on ebay everyone says they're not worth it or strong enough...
CFL grow lights are good though - just using a single 125-watt ebay light in my little cupboard now with what is looking like good results!
(I only used 2 20-watt and 1 23-watt spirally CFLs last time and got a q off each plant...not only that but I've been told it was good stuff from people who I've never even met)