I have the 150w. It is what it is.
It's nice for what i have it for, but i wouldn't want any bigger lights like that. Mostly because of cooling issues, but i also like to be able to replace broken stuff, use ballasts of my choice, and i like to use certain brands of bulbs. Not all HPS bulbs are built the same, and i like to have the best spectrum and most lumens per watt possible.