Be wary of the Odyssea fixtures. They use very cheap ballasts that may burn out quickly. There were reports of their MH fixtures causing fires way back in the day. In addition, they probably use a single sheet reflector which will drastically reduce output along with no active cooling for the bulbs which will also reduce bulb life.
When looking for a quality T5 fixture, you want programmed start ballasts (not rapid start), active bulb cooling and individual reflectors for each bulb. All of these features are found in an ATI Sunpower fixture.