I own six Ego tools and have been very happy with the performance and value of the whole line. I added the tiller attachment this spring to our collection. This is the first Ego item I would say is a poor value for what you pay compared to what you get -- especially at the new May 2019 increased pricing.
Out of the box, weight is not bad, and both shaft and housing are solid. The tines are installed and removed simply enough with a cotter pin on each side the axle. The cover guard is very cheap plastic instead of aluminum. There is no additional handle or gripping pad which would help with usage.
In use, power transfers well down the shaft, but you will find the tines are poorly designed. They do not interweave enough together and they do not have enough edge or angle to chop well, which makes for a bad combination. If you have any vegetation on the ground it will get wrapped around the axle in between the tines and especially over the center housing, building a mass that prevents tilling down into the the soil. If you have clay or harder dirt, the tines will not grab or chop in -- they bounce off. If you press down on the unit, you can help this defect some (hence, a grippng pad on the shaft should be provided). Another design issue is the central gear housing. The housing is pretty machined aluminum -- strong and light. However, a plate sticks out between the tines on the bottom, that is only exceeded by one inch. Ironically to the top, front or back, the housing is tight and gives the tines 2-3 inches of clearance (which would be great), but on the bottom where you work your dirt there is only one available inch.
Now, if you clear your vegetation and pre-work your soil, then the Ego will work that top inch of ground. Other Ego products exceed their competition's capabilities -- not this tiller.
Ego has not put the same level of engineering into this product the edger, chainsaws, blowers, hedge and grass trimmers received. It seems rushed to fill a product line gap. It has the power, but that's it. It needs stronger, longer, better designed tines, a less intrusive housing, and better ergonomics. For it's capabilities, this unit would be rated higher if about $60-70 less. At the current cost, it in no way rivals even a small dedicated tiller like a Mantis.