I have a Performax 16/32 purchased around 1999 - 2000. I had not heard of "Smartsand". I think the term is "Sandsmart" based on this article.
http://www.halfinchshy.com/2011/04/upgrading-performax-16-32-to-sandsmart.html
Reading the article it mentions about the drum sander popping a breaker if the drum is set too low and the sander is trying to take off too much wood. Been there, done that. Lesson learned.
Now I ensure I am taking off a light pass. The "Sandsmart" is meant to slow down the feed belt if the drum is set too low.
This may work, but since I experienced my first breaker popping, I have not had one since, due to my paying attention to the height of the drum.
Your experience may differ, but I would not pass on the drum sander due to not having "Sandsmart".
My unit only had 2 1/2in port on the hood. I cut this out and glued in a 4in port. Big difference in airflow and dust collection.
If you do get a drum sander, I highly recommend the blue zirconia abrasive from Klingspor. More expensive, but it lasts a LOT longer than the normal brown abrasive.
Less heat, easier to clean with the rubber stick, no burning on the wood.
http://www.woodworkingshop.com/category.aspx?id=22&f4=ALUMINUM+ZIRCONIA