As other reviewers noted, these Smarty Plus packets an be a tight fit in the detergent dispenser, though we've never had one that didn't fit in our Miele. We started with Smarty Plus, then used a pack of Smarty, and back to Smarty Plus, and then back to another pack of Smarty. Just reordered Smarty Plus (these), as they clean at least as well as the Smarty tabs, and leave the dishwasher smelling cleaner than the enzyme based Smarty formula. We pack the dishwasher very full of un-rinsed (but scraped, if there is large stuff) dishes and get between zero and three dishes that aren't totally clean in each load--not bad.
Your results may vary depending on water and dishwasher. Our water is very mildly hard (doesn't form significant hard water spots on taps, etc, but will gradually build deposits in kettles), and we supply hot water (not cold) to the dishwasher. The dishwasher also heats the water for some parts of the cycle. We run the pots and pans cycle every time.