There are many extra excursions that you have to pay for and you don't find out about them until a few weeks before your trip.
There is a lot of walking.
Some of the visits feel like tourist traps - Chocolate truffle making lesson at chocolate museum in Brussels was not a chocolate making class; cheese and clog store - owners were crude - like a tourist trap.
Pay attention to the hotels, because some of them are not nice and are outside of the city vs. other tours with the same company, stay at the nicer hotels in the nice city.
Tour guide was not always helpful in knowing where nice local shopping (not high end name brand stores) was and we wandered aimlessly - estra walking that could have been avoided.
Need to watch tour dates because if you are visiting a city during one of their holidays or on Sunday, the stores will be closed.
Ypres visit is late in the day and nothing is open - just have to wait for the Last Ceremony.
Tour guide rambled a lot and was not always helpful.
Chocolate museum in Brussels was busy and hard to go through with the device that you have to put on the wall in order for it to tell you stories about chocolate. Was not convenient or fun.
The bus was restricted sometimes, but other times did not drop us off close to where we needed to go. We had to find our way back to the hotel - walk a long ways, taxi, or other public transportation, on at least 3 occasions.
Bulk drop off at Amsterdam airport was very far away, when other tour buses were much closer.
Dinner in Luxembourg at old stable and dinner in Monnikendam and dinner in Amsterdam restaurant was very good.