i always hear Odyssea ballasts are notoriously cheap and prone to failure whenever aqua traders gets brought up in a post for buying cheap lighting. i have also heard they are rather dim for their wattage even when they are working fine. IMO i would stay away, for me it falls into the "too good to be true category"
but then again i do remember they were always talking about the odyssea MH ballasts, maybe their t-5 systems are better.