light therapy alarm clock

Anyone use a light therapy alarm clock? I'm debating getting one and would like to hear reviews from real people about how well they work and the best brands. Hoping it would help with morning workouts!

This is an example for anyone who hasn't heard of the product:
http://www.amazon.com/Philips-Hf3470-Wake-up-Light-White/dp/B003XN4RIC/ref=pd_sim_sbs_hpc_1