Price difference between TEK and ATI Sunpower doesn't seem that huge especially when you consider that all the stuff that comes with the ATI is charged extra on the TEK (hanging kit -$25, acrylic shield - $45, etc.)
Like my set up as a ATI Sunpower is $620, If I bought everything extra to get the same with a TEK fixture I'd pay $590 - $30 that's not worth mulling about.