Toro offers an enhancement kit for my 42” fabricated deck which I considered.  I’m confident that it will improve collection of clippings.  My concern, and the reason that I didn’t purchase the kit, was it will create areas where clippings will collect and lay on the baffles (like small shelves).  I think this will substantially increase the difficulty in cleaning the deck and potentially corrosion.  I flush my deck with the water hose cleaning adapter every time I use it.  I’ve also occasionally treated the deck with Gunk mower deck spray.  So far it’s working pretty well.