EDIT because I also got the 3-9m kit. To start, Adena is the OG before LE (so, not a "dupe," just affordable quality!) Adena's been around 19years, which makes me feel great about the quality and design of each item. That being said, here's the info everyone is looking for: the comparison to the "senser" kit (i have both!) For the 3-9m kit...spinning drum: its the same size as the LE, but the adena has more colors, a mirror, and ridged "frames" that help baby spin it better. The adena also has a bell inside that jingles no matter how fast you spin it, while the LE has a wooden ball that you wont hear at super fast spinning speeds. Both are equally smooth to spin. I like the LE colors better, but I like the ridged "frame" design, bell, and added mirror part on the Adena more. Adena wins this one.wobbler: this is smaller than the LE one and is wooden and not as colorful (LE's is plastic, but catches babys eye better.) the small wobbler from adena is great for babys small hands, and i find my 4mo prefers it. i can also see it becoming a projectile when shes older, whereas the size of the LE might mean it is used appropriately longer. the smaller adena one moves a bit further when really flicked, which i like better for encouraging movement and crawling. This is just barely a tie for me. If Adena added some color and intrigue, itd win.the adena ball is MUCH bigger than LE's and easier to grasp. Its also different textures, whereas LE is all the same cotton. The adena ball will facilitate MANY more discussions and experiences, and will last beyond the LE ball. Adena wins this one hands down.fabric "tissues": adena's fabrics are all different textures and colors, but they dont have a button hole for attaching together. is that neccessary? no, but its nice. Can i easily alter them to create a button hole on each? for some, yes, for others, no. (will i? absolutely not.) the added benefit of the button hole is extending the lesson when baby is older and learning to button. LE's are all the same cotton, but different colors. LE also has the corner that goes into the button hole reinforced. this ones kind of a tie. I like that theyre different textures and fabrics, but i like the button holes of the LE.Tissue box: The face with the red nose confuses me. It doesnt seem to serve a purpose, yet it presents as if it should. the hole for the tissues to come out is just a hole. the bottom connects with TINY magnets...or, it should. mine actually doesnt fit but was wedged into the square so much so that it warped the box. not only did i have to pry it off and it wouldnt go back on, but the magnets just make me uneasy. The LE box has fabric cover the hole to help create resistance and mystery, but it also fits correctly and is held in place by rubberized sides. LE wins with the box.so some things are different: Adena has a vertical dowel posting material with 3 rings and the circle mirror puzzle. LE has a "play guide" and a book. comparing these extras against one another at face value, adena wins. the posting activity is definitely a necessary step to the posting activity in either brand's next level up, and the circle mirror puzzle is perect for this age which LOVES looking at themselves and other babys! the LE play guide is nice, but the info can easily be obtained online, and there are long-standing alternatives to the book. I will say that Adena could save some production costs by excluding the large circle puzzle from the next set since this set has the circle mirror puzzle.Overall, for the 3-9 set, Adena comes out on top as not only better implementation of most of the components and stimulating a childs age-appropriate development for this age, but also for overall price and practicality of purchase without committing to a subscription.Below, I chose the Adena 0-6m set over the LE, hands down, without even trying to LE version. It has most or all of the same components, and (as mentioned above) i was confident in Adena's ability to deliver on quality since theyve been a name in the montessori business since before my oldest (now 14) was a baby.The 0-6m kit is great for developing visual awareness, sensory, and motor play. The book crinkles and has a squeaker, the teether is silicone (soft and easy to hold, simple to clean), and the wood components are smooth without splinters. The cards for the mirror display are plastic and fit all slots without issues. The rattle is the only piece with a gloss finish (presumably because it is painted in the middle section.) these items will definitely last the full 6 month range and possibly longer. If you’re looking at this as an alternative kit, just be aware that there is no play guide, it’s just the toys.