"These kits are an excellent way to introduce someone to LEGO Serious Play methods.
You need to consider what kind of workshop you'll be running to determine if these are the right ones for you. The set has enough variety to run just about any individual or pair build activity over a 1-3 day Facilitators class.
However these sets are not really designed for group building activities where a combined build is created. There's nothing really missing, but you'll spend a lot of time re-sorting afterwards. Instead you should get an Identity and Landscape kit if that is your goal.
Finally if you're only looking to run a 1-2 hour workshop for individuals, then I'd recommend the Windows Exploration kit. Starter kits are nice in that you can order only the number you need, but are a little expensive if you're just running quick sessions plus they take up more space if you're travelling.
I tend to give these away as part of Facilitator training and find them very useful for people just starting to explore the techniques on their own. More variety than the Window Exploration and much more cost effective than Landscape."