this set is a great addition for the new wave of H.P. sets coming out, especially is you have the castle to attach it to.
the car is pretty cool, and it can actually hold both minifigs (not side by side though) and the trunk can open and holds two suitcases.
the whomping willow can hold the car and spin it until the car goes flying (comes with a couple huge stickers, but they're not too bad to attach).
though the set is named after the whomping willow, the castle build is what i was truly aiming for to add it to the larger hogwarts castle.
snapes office is pretty cool but i turned it to dumbledore's office instead (dumbledore needed more space). even added a pedestal to hold his memory plate from the collectible minifigures series and a clip to hold tom riddle's book that came with dobby.
the potions lab is pretty fun to play in though my 6 year old wanted desks, so i threw some together from my other pieces and they just sit on the table near the classroom. also added a clip on the wall to hold mad eye moody's potion from the collectible minis.
i love that the car can drive through the entry gate, and i can't wait to see if the carriage from the upcoming grindlewald's escape can fit also.
slightly remodled the owlery so it can fit both the owls now (harry's and cho's)
the dormitory is pretty basic, just a couple of beds.
i'm hoping more expansion sets like this are in the works; or will be soon. maybe the next expansion can include settings such as the defence against dark arts classroom and a greenhouse so i have someplace to put my mandrakes which are also from the collectible minis series.
all i can say in final is if you get the castle, get this set too. it's well worth it to expand your school.