I started out with building the KAZI set, of which I bought two because that meant outrageous discount in a trade-spectacular end of March.
Most parts go easily on and stick decently, but some have slight disfigurements that make them hard to apply. There are no big problems with building and it can be completed in a fairly straight forward manner, but at some points I had to wonder: "Would any kid under 16 have the finger strength to get everything on? I unfortunately forgot to take a picture of it, but on one of the sides the "Police" print was set too far to the left, making it an "olice" helicopter on that side.The fit to normal LEGO was acceptable, although the alignment is not optimal.There was a little shaving and cramping on both ends, but visually the elements seemed to match and it wasn't very hard to combine parts in various manners.I would, however, not advise it on account of increased risk of wear and tear on either side. The first thing that caught my eye about the set was the great finish of the parts, things looked familiar, smooth and reusable.There are minor differences, and you can see the real brand has more experience in producing the parts, but even the skeleton with the treasure chest caught my eye, because it actually felt a bit rattly, without falling apart.
Also on the figurines the joints feel good, the hands snap in, allowing easy rotation without constantly falling out.
Some results: Next, after the slight disappointment of KAZI's finish I decided to go with Enlighten, because I had seen Sluban in some local shops and I had some faith they had done some research. Not only that, while building I actually got a little bit giddy of the smooth fit of each part onto the next.
Clearly these parts had some time put in to make generic parts stack in a neat way.
But in a way this was sometimes also true of the genuine article all those years back.
Sluban did its best to resemble the genuine booklets, with a small block indicating the parts to be used in a step, displayed next to the actual layer of parts to be added in vibrant colours, on top the faded colours of the previous step: That said, I did also enjoy the KAZI and the Enlighten booklets.
This breaks a little from the ideology "Gather your tools first, count them, then build" but it does add a little to the clarity and ease of it all.